Microphysical variability in southeast Pacific Stratocumulus clouds: synoptic conditions and radiative response

Synoptic and satellite-derived cloud property variations for the southeast Pacific stratocumulus region associated with changes in coastal satellite-derived cloud droplet number concentrations (<i>N</i><sub><i>d</i></sub>) are explored. MAX and MIN <i>N</i><sub><i>d</i></sub> composites are defined by the top and bottom terciles of daily area-mean <i>N</i><sub><i>d</i></sub> values over the Arica Bight, the region with the largest mean oceanic <i>N</i><sub><i>d</i></sub>, for the five October months of 2001, 2005, 2006, 2007 and 2008. The ability of the satellite retrievals to capture composite differences is assessed with ship-based data. <i>N</i><sub><i>d</i></sub> and ship-based accumulation mode aerosol concentrations (<i>N</i><sub><i>a</i></sub>) correlate well (<i>r</i> = 0.65), with a best-fit aerosol activation value <span style="border-bottom: 1px solid #000; vertical-align: 50%; font-size: .7em; color: #000;"><i>d</i>ln <i>N</i><sub><i>d</i></sub></span><span style="margin-left: -2.7em; margin-right: 0.5em; vertical-align: -45%; font-size: .7em; color: #000;"><i>d</i>ln <i>N</i><sub><i>a</i></sub></span> of 0.56 for pixels with <i>N</i><sub><i>d</i></sub>>50 cm<sup>−3</sup>. The adiabatically-derived MODIS cloud depths also correlate well with the ship-based cloud depths (<i>r</i>=0.7), though are consistently higher (mean bias of almost 60 m). The MAX-<i>N</i><sub>d</sub> composite is characterized by a weaker subtropical anticyclone and weaker winds both at the surface and the lower free troposphere than the MIN-<i>N</i><sub><i>d</i></sub> composite. The MAX-<i>N</i><sub>d</sub> composite clouds over the Arica Bight are thinner than the MIN-<i>N</i><sub>d</sub> composite clouds, have lower cloud tops, lower near-coastal cloud albedos, and occur below warmer and drier free tropospheres (as deduced from radiosondes and NCEP Reanalysis). CloudSat radar reflectivities indicate little near-coastal precipitation. The co-occurrence of more boundary-layer aerosol/higher <i>N</i><sub><i>d</i></sub> within a more stable atmosphere suggests a boundary layer source for the aerosol, rather than the free troposphere. <br><br> The MAX-<i>N</i><sub><i>d</i></sub> composite cloud thinning extends offshore to 80° W, with lower cloud top heights out to 95° W. At 85° W, the top-of-atmosphere shortwave fluxes are significantly higher (~50%) for the MAX-<i>N</i><sub>d</sub> composite, with thicker, lower clouds and higher cloud fractions than for the MIN-<i>N</i><sub>d</sub> composite. The change in <i>N</i><sub><i>d</i></sub> at this location is small (though positive), suggesting that the MAX-MIN <i>N</i><sub>d</sub> composite differences in radiative properties primarily reflects synoptic changes. Circulation anomalies and a one-point spatial correlation map reveal a weakening of the 850 hPa southerly winds decreases the free tropospheric cold temperature advection. The resulting increase in the static stability along 85° W is highly correlated to the increased cloud fraction, despite accompanying weaker free tropospheric subsidence

Does precipitation susceptibility vary with increasing cloud thickness in marine stratocumulus?

The relationship between precipitation rate and accumulation mode aerosol concentration in marine stratocumulus-topped boundary layers is investigated by applying the precipitation susceptibility metric to aircraft data obtained during the VOCALS Regional Experiment. A new method to calculate the precipitation susceptibility that incorporates non-precipitating clouds is introduced. The mean precipitation rate <i>R</i> over a segment of the data is expressed as the product of a drizzle fraction <i>f</i> and a drizzle intensity <i>I</i> (mean rate for drizzling columns). The susceptibility <i>S</i><sub>x</sub> is then defined as the fractional decrease in precipitation variable <i>x</i> = {<i>R</i>, <i>f</i>, <i>I</i>} per fractional increase in the concentration of aerosols with dry diameter >0.1 μm, with cloud thickness <i>h</i> held fixed. The precipitation susceptibility <i>S</i><sub>R</sub> is calculated using data from both precipitating and non-precipitating cloudy columns to quantify how aerosol concentrations affect the mean precipitation rate of all clouds of a given <i>h</i> range and not just the mean precipitation of clouds that are precipitating. <i>S</i><sub>R</sub> systematically decreases with increasing <i>h</i>, and this is largely because <i>S</i><sub>f</sub> decreases with <i>h</i> while <i>S</i><sub>I</sub> is approximately independent of <i>h</i>. In a general sense, <i>S</i><i>f</i> can be thought of as the effect of aerosols on the probability of precipitation, while <i>S</i><sub>I</sub> can be thought of as the effect of aerosols on the intensity of precipitation. Since thicker clouds are likely to precipitate regardless of ambient aerosol concentration, we expect <i>S</i><sub>f</sub> to decrease with increasing <i>h</i>. The results are broadly insensitive to the choice of horizontal averaging scale. Similar susceptibilities are found for both cloud base and near-surface drizzle rates. The analysis is repeated with cloud liquid water path held fixed instead of cloud thickness. Simple power law relationships relating precipitation rate to aerosol concentration or cloud droplet concentration do not capture this observed behavior

Aerosol-Radiation-Cloud Interactions in the South-East Atlantic: Results from the ORACLES-2016 Deployment and a First Look at ORACLES-2017 and Beyond

Seasonal biomass burning (BB) in Southern Africa during the Southern hemisphere spring produces almost a third of the Earth's BB aerosol particles. These particles are lofted into the mid-troposphere and transported westward over the South-East (SE) Atlantic, where they interact with one of the three semi-permanent subtropical stratocumulus (Sc) cloud decks in the world. These interactions include adjustments to aerosol-induced solar heating and microphysical effects. The representation of these interactions in climate models remains highly uncertain, because of the scarcity of observational constraints on both, the aerosol and cloud properties, and the governing physical processes. The first deployment of the NASA P-3 and ER-2 aircraft in the ORACLES (ObseRvations of Aerosols Above Clouds and Their IntEractionS) project in August/September of 2016 has started to fill this observational gap by providing an unprecedented look at the SE Atlantic cloud-aerosol system. We provide an overview of the first deployment, highlighting aerosol absorptive and cloud-nucleating properties, their vertical distribution relative to clouds, the locations and degree of aerosol mixing into clouds, cloud changes in response to such mixing, and cloud top stability relationships to the aerosol. We also expect to describe preliminary results of the second ORACLES deployment from Sao Tome and Principe in August 2017. We will make an initial assessment of the differences and similarities of the BB plume and cloud properties as observed from a deployment site near the plume's northern edge. We will conclude with an outlook for the third ORACLES deployment in October 2018

Aerosol-Radiation-Cloud Interactions in the South-East Atlantic: First Results from the ORACLES-2016 Deployment and Plans for Future Activities

Southern Africa produces almost a third of the Earths biomass burning (BB) aerosol particles. Particles lofted into the mid-troposphere are transported westward over the South-East (SE) Atlantic, home to one of the three permanent subtropical stratocumulus (Sc) cloud decks in the world. The SE Atlantic stratocumulus deck interacts with the dense layers of BB aerosols that initially overlay the cloud deck, but later subside and may mix into the clouds. These interactions include adjustments to aerosol-induced solar heating and microphysical effects, and their global representation in climate models remains one of the largest uncertainties in estimates of future climate. Hence, new observations over the SE Atlantic have significant implications for regional and global climate change predictions.Our understanding of aerosol-cloud interactions in the SE Atlantic is severely limited. Most notably, we are missing knowledge on the absorptive and cloud nucleating properties of aerosols, including their vertical distribution relative to clouds, on the locations and degree of aerosol mixing into clouds, on the processes that govern cloud property adjustments, and on the importance of aerosol effects on clouds relative to co-varying synoptic scale meteorology.We describe first results from various synergistic, international research activities aimed at studying aerosol-cloud interactions in the region:NASAs airborne ORACLES (ObseRvations of Aerosols Above Clouds and Their IntEractionS) deployment in AugustSeptember of 2016,the DoEs LASIC (Layered Atlantic Smoke Interactions with Clouds) deployment of the ARM Mobile Facility to Ascension Island (June 2016 October 2017), the ground-based components of CNRS AEROCLO-sA (Aerosols Clouds and Fog over the west coast of southern Africa), and ongoing regional-scale integrative, process-oriented science efforts as part of SEALS-sA (Sea Earth Atmosphere Linkages Study in southern Africa).We expect to describe experimental setups as well as showcase initial aerosol and cloud property distributions. Furthermore, we discuss the implementation of future activities in these programs in coordination with the UK Met Offices CLARIFY (CLoud-Aerosol-Radiation Interactions and Forcing) experiment in 2017

Observations of Aerosol-Radiation-Cloud Interactions in the South-East Atlantic: First Results from the ORACLES Deployments in 2016 and 2017

Southern Africa produces almost a third of the Earths biomass burning (BB) aerosol particles. Particles lofted into the mid-troposphere are transported westward over the South-East (SE) Atlantic, home to one of the three permanent subtropical stratocumulus (Sc) cloud decks in the world. The SE Atlantic stratocumulus deck interacts with the dense layers of BB aerosols that initially overlay the cloud deck, but later subside and often mix into the clouds. These interactions include adjustments to aerosol-induced solar heating and microphysical effects, and their global representation in climate models remains one of the largest uncertainties in estimates of future climate. Hence, new observations over the SE Atlantic have significant implications for regional and global climate change predictions.The low-level clouds in the SE Atlantic have limited vertical extent and therefore present favorable conditions for their exploration with remote sensing. On the other hand, the normal coexistence of BB aerosols and Sc clouds in the same scene also presents significant challenges to conventional remote sensing techniques. We describe first results from NASAs airborne ORACLES (ObseRvations of Aerosols Above Clouds and Their IntEractionS) deployments in September 2016 and August 2017. We emphasize the unique role of polarimetric observations by two instruments, the Research Scanning Polarimeter (RSP) and the Airborne Multi-angle SpectroPolarimeter Imager (AirMSPI), and describe how these instruments help address specific ORACLES science objectives. Initial assessments of polarimetric observation accuracy for key cloud and aerosol properties will be presented, in as far as the preliminary nature of measurements permits

Living Kidney Donation: Psychological and Ethical Aspects

DOELSTELLING Nierdonatie bij leven levert medisch en maatschappelijk gezien veel voordelen op, maar toch willen of kunnen niet alle nierpatiënten op de wachtlijst en/of hun naasten zich opgeven voor het nierdonatie bij leven programma. De doelstelling van het project ‘Nierdonatie bij leven: psychologische en ethische aspecten’ is het verkrijgen van meer inzicht in de kennis en acceptatie van nierdonatie bij leven. Het gaat hierbij om kennis en acceptatie onder proefpersonen die daadwerkelijk in aanmerking komen voor nierdonatie/ transplantatie bij leven, dat wil zeggen (1) patiënten met eindfase nierfalen op de wachtlijst voor een niertransplantatie en (2) de mensen uit hun omgeving; de potentiële donoren. Het benaderen van deze groepen is de strategie om uit te vinden of, en onder welke voorwaarden, uitbreiding van het nierdonatie bij leven programma praktisch haalbaar en ethisch verdedigbaar is. VRAAGSTELLINGEN Het project omvat twee vraagstellingen. De eerste vraagstelling is: wat zijn de psychologische barrières voor nierdonatie bij leven voor patiënten op de wachtlijst, en de mensen uit hun omgeving? De tweede vraagstelling luidt: wat zijn de morele argumenten om de patiënt en de mensen uit de omgeving van de patiënt (de potentiële donoren) al dan niet actief te benaderen over nierdonatie bij leven? In andere woorden; in hoeverre zijn interventies ethisch verdedigbaar? OPZET PATIËNTEN EN (POTENTIËLE) DONOREN Wij hebben allereerst de groep patiënten die op de wachtlijst voor niertransplantatie staat benaderd (regio Erasmus MC). Aan de patiënt vragen wij toestemming om ook de potentiële donoren uit zijn of haar omgeving te benaderen. Indien beiden hiermee instemmen, vindt het interview met deze potentiële donor plaats. Voor deze studie hebben we tevens een controlegroep benaderd. In de controlegroep zitten patiënten en donoren die nog geen familietransplantatie hebben ondergaan, maar die wel al hebben besloten door te gaan met de donatie bij leven procedure en dit met hun artsen hebben overlegd. INTERVIEW Alle deelnemers aan ons onderzoek zijn geïnterviewd middels een semi-gestructureerd interview. Voorafgaand onderzoek heeft aangetoond dat een aantal factoren een rol kan spelen bij het niet kunnen of willen ondergaan van nierdonatie bij leven. Deze factoren komen terug in de interviews: · Demografische en medische variabelen · Kennis en informatie · Standpunten en argumenten ten aanzien van nierdonatie bij leven, · Communicatie met de arts en de omgeving · Risicoperceptie · Verwachtingen ten aanzien van de gevolgen voor de persoonlijke relatie tussen donor en ontvanger. ETHISCHE ANALYSE De resultaten van de empirische gedeelte van deze studie dienen als basis voor de ethische analyse. Argumenten zoals gevonden in het empirische gedeelte van de studie worden getoetst op houdbaarheid met behulp van ethische theorieën over de structuur van argumenten.,Wij hebben met name gebruik gemaakt van de theorien zoals die geformuleerd zijn door Toulmin, Rawls en Nagel. BEREIKTE RESULTATEN/NIEUWE INZICHTEN De bereidheid om een nier van iemand in de naaste omgeving te accepteren is zeer hoog voor de patiënten in de onderzoeksgroep: slecht 19% is negatief over donatie bij leven. Het is dus niet zo dat de patiënt in het algemeen niet zou willen. Voor een aantal variabelen vonden we verschillen tussen de onderzoeksgroep en de controlegroep. Een opvallende uitkomst is dat in vrijwel àlle gevallen in de controle groep de communicatie over de donatie gestart wordt vanuit de donor: het al dan niet aangeboden krijgen van een nier lijkt bepalend voor het doorgaan van de (levende donor) transplantatie. Patiënten vinden het erg moeilijk om uit zichzelf over het onderwerp te beginnen. Ethische analyse laat zien dat de argumenten en bezwaren tegen nierdonatie bij leven zoals gevonden in de onderzoeksgroep weerlegbaar zijn. Dit gegeven draagt bij aan de rechtvaardiging van interventies in de situatie van paPURPOSE Living kidney donation offers many advantages, both from a medical and societal point of view. However, there is a group of patients that cannot or will not make use of the living kidney donation program. The purpose of the study ‘Living Kidney donation: psychological and ethical aspects’ is to gain insight into the knowledge and acceptance of this form of kidney transplantation. The group we investigate is the group that actually is eligible for living kidney donation / transplantation, namely (1) patients with end stage renal disease on the transplantation waiting list and (2) the persons in their close environment, the potential donors. Investigating these groups is the strategy to find out if, and under what circumstances, expansion of the living kidney donation program is feasible and ethically acceptable. RESEARCH QUESTIONS The project comprises two research questions. The first research question is: what are the psychological barriers for living kidney donation for the patients and the people in their close environment? The second research question is: what are the moral arguments to deal or actively or passively with the persons in the close environment of the patients who are the potential donors? In other words, to what extent are interventions morally acceptable? DESIGN PATIENTS We have approached the group of patients on the waiting list for a kidney transplant (region of the Erasmus University Medical Center). We asked the patients for permission to approach individuals in their personal environment, the potential donors. If both (patient and relative of patient) agreed on this, we interviewed these potential donors as well. We also included a control group in our study. This group consists of patients and their actual donors who have planned to undergo living kidney donation/transplantation in the near future and had already made arrangements together with their clinicians. INTERVIEW All participants in our study were interviewed by means of a semi-structured interview. Former research has shown various variables that influence willingness to undergo living kidney donation / transplantation. These variables are included in the interview: · Sociodemographic and medical variables · Knowledge and information · Acceptance of, and argument about of living kidney donation · Communication with the specialist and the personal environment · Risk perception · Expectations regarding the personal relationship between patient and donor. ETHICAL ANALYSIS Ethical analysis is based on the results of the empirical part of the study. Reasoning as found in the empirical part of the study is tested for ethical justification, using ethical theory on the structure of argumentation especially the theories as formulated by Toulmin, Rawls and Nagel. BEREIKTE RESULTATEN/NIEUWE INZICHTEN The willingness to accept the offer of a living kidney donor is very high for patients in the group of interest: only 19% has a negative attitude towards ling donation. Thus, it is not a matter of unwillingness of the patients to accept a living kidney donor. We found a number of differences between the group of interest and the control group. A notable finding is that the communication about kidney donation in the control group is almost always initiated by the donor : being offered a kidney (or not) seems to be decisive for either or not pursuing living kidney donation. Patients find it very difficult to bring up the topic them selves. Ethical analysis shows that the arguments or objections against living kidney donation as raised by the group of interest can be refuted. This adds to the moral acceptability of interventions in the situation of patients on the waiting list for transplantation who do not enter the living kidney donation program initially

De Behoefte aan Psychosociale Steun bij Deelnemers aan het Nederlandse Cross-over Transplantatie Programma

Final technical report of the project.The Dutch kidney exchange donation program started in January 2004. A literature review has shown that several factors of the exchange program could influence the psychological well being of participants, such as the loss of the possibility of a “medical excuse” for unwilling donors and the issue of anonymity. However, these factors have not been the subject of empirical study yet. We therefore studied these factors to determine whether additional psychosocial support is necessary for donors and recipients in the Dutch kidney exchange program. We used structured interviews for all 48 donors and recipients that had undergone exchange donation/ transplantation in 2004. A psychologist interviewed the participants before and 3 months after transplantation. We included a comparison group of 48 donors and recipients participating in the regular living kidney donation program. Donors did not experience additional pressure to donate due to the exchange donation. Most participants preferred anonymity between the couples. We found few needs for additional emotional support. In this respect the exchange group did not differ from the comparison group. We conclude that the psychosocial support offered to exchange couples can be comparable to the support normally offered to participants in the regular living kidney donation program

A coupled terrestrial and aquatic biogeophysical model of the Upper Merrimack River watershed, New Hampshire, to inform ecosystem services evaluation and management under climate and land-cover change

Accurate quantification of ecosystem services (ES) at regional scales is increasingly important for making informed decisions in the face of environmental change. We linked terrestrial and aquatic ecosystem process models to simulate the spatial and temporal distribution of hydrological and water quality characteristics related to ecosystem services. The linked model integrates two existing models (a forest ecosystem model and a river network model) to establish consistent responses to changing drivers across climate, terrestrial, and aquatic domains. The linked model is spatially distributed, accounts for terrestrial–aquatic and upstream–downstream linkages, and operates on a daily time-step, all characteristics needed to understand regional responses. The model was applied to the diverse landscapes of the Upper Merrimack River watershed, New Hampshire, USA. Potential changes in future environmental functions were evaluated using statistically downscaled global climate model simulations (both a high and low emission scenario) coupled with scenarios of changing land cover (centralized vs. dispersed land development) for the time period of 1980–2099. Projections of climate, land cover, and water quality were translated into a suite of environmental indicators that represent conditions relevant to important ecosystem services and were designed to be readily understood by the public. Model projections show that climate will have a greater influence on future aquatic ecosystem services (flooding, drinking water, fish habitat, and nitrogen export) than plausible changes in land cover. Minimal changes in aquatic environmental indicators are predicted through 2050, after which the high emissions scenarios show intensifying impacts. The spatially distributed modeling approach indicates that heavily populated portions of the watershed will show the strongest responses. Management of land cover could attenuate some of the changes associated with climate change and should be considered in future planning for the region

Faulkner\u27s Mothers: The Relationship of Fact to Fiction In The Sound and the Fury and As I Lay Dying

The author explores the relationship between actual events and circumstances in Faulkner’s own life and the fiction hat he wrote in his novels. William Faulkner was able to write his best work because he expected nothing from it. He was previously rejected by publishers, but furthermore rejected by his own family and two love interests. His mother was the only constant in his life. However she lacked love and caring and was domineering. These feelings of inferiority in Faulkner reflect in the children he wrote about and the traits of his mother reflect in the mothers in his novels as well

DoLFIn: Distributions over Latent Features for Interpretability

Interpreting the inner workings of neural models is a key step in ensuring the robustness and trustworthiness of the models, but work on neural network interpretability typically faces a tradeoff: either the models are too constrained to be very useful, or the solutions found by the models are too complex to interpret. We propose a novel strategy for achieving interpretability that – in our experiments – avoids this trade-off. Our approach builds on the success of using probability as the central quantity, such as for instance within the attention mechanism. In our architecture, DoLFIn (Distributions over Latent Features for Interpretability), we do no determine beforehand what each feature represents, and features go altogether into an unordered set. Each feature has an associated probability ranging from 0 to 1, weighing its importance for further processing. We show that, unlike attention and saliency map approaches, this set-up makes it straight-forward to compute the probability with which an input component supports the decision the neural model makes. To demonstrate the usefulness of the approach, we apply DoLFIn to text classification, and show that DoLFIn not only provides interpretable solutions, but even slightly outperforms the classical CNN and BiLSTM text classifiers on the SST2 and AG-news datasets.</p