77 research outputs found
Nervous system: Peripheral neuroblastic tumours (Neuroblastoma, Ganglioneuroblastoma, Ganglioneuroma)
Review on Nervous system: Peripheral neuroblastic tumours (Neuroblastoma, Ganglioneuroblastoma, Ganglioneuroma), with data on clinics, and the genes involved
Consistency of satellite-based precipitation products in space and over time compared with gauge observations and snow- hydrological modelling in the Lake Titicaca region
This paper proposes a protocol to assess the space–time consistency of 12
satellite-based precipitation products (SPPs) according to various
indicators, including (i) direct comparison of SPPs with 72 precipitation
gauges; (ii) sensitivity of streamflow modelling to SPPs at the outlet of
four basins; and (iii) the sensitivity of distributed snow models to SPPs
using a MODIS snow product as reference in an unmonitored mountainous area.
The protocol was applied successively to four different time windows
(2000–2004, 2004–2008, 2008–2012 and 2000–2012) to account for the
space–time variability of the SPPs and to a large dataset composed of
12 SPPs (CMORPH–RAW v.1, CMORPH–CRT v.1, CMORPH–BLD v.1, CHIRP v.2, CHIRPS
v.2, GSMaP v.6, MSWEP v.2.1, PERSIANN, PERSIANN–CDR, TMPA–RT v.7, TMPA–Adj
v.7 and SM2Rain–CCI v.2), an unprecedented comparison. The aim of using
different space scales and timescales and indicators was to evaluate whether
the efficiency of SPPs varies with the method of assessment, time window and
location. Results revealed very high discrepancies between SPPs. Compared to
precipitation gauge observations, some SPPs (CMORPH–RAW v.1, CMORPH–CRT
v.1, GSMaP v.6, PERSIANN, and TMPA–RT v.7) are unable to estimate regional
precipitation, whereas the others (CHIRP v.2, CHIRPS v.2, CMORPH–BLD v.1,
MSWEP v.2.1, PERSIANN–CDR, and TMPA–Adj v.7) produce a realistic
representation despite recurrent spatial limitation over regions with
contrasted emissivity, temperature and orography. In 9 out of 10 of the cases
studied, streamflow was more realistically simulated when SPPs were used as
forcing precipitation data rather than precipitation derived from the
available precipitation gauge networks, whereas the SPP's ability to
reproduce the duration of MODIS-based snow cover resulted in poorer
simulations than simulation using available precipitation gauges.
Interestingly, the potential of the SPPs varied significantly when they were
used to reproduce gauge precipitation estimates, streamflow observations or
snow cover duration and depending on the time window considered. SPPs thus
produce space–time errors that cannot be assessed when a single indicator
and/or time window is used, underlining the importance of carefully
considering their space–time consistency before using them for
hydro-climatic studies. Among all the SPPs assessed, MSWEP v.2.1 showed the
highest space–time accuracy and consistency in reproducing gauge
precipitation estimates, streamflow and snow cover duration.</p
Global assessment of marine plastic exposure risk for oceanic birds
Plastic pollution is distributed patchily around the world’s oceans. Likewise, marine organisms that are vulnerable to plastic ingestion or entanglement have uneven distributions. Understanding where wildlife encounters plastic is crucial for targeting research and mitigation. Oceanic seabirds, particularly petrels, frequently ingest plastic, are highly threatened, and cover vast distances during foraging and migration. However, the spatial overlap between petrels and plastics is poorly understood. Here we combine marine plastic density estimates with individual movement data for 7137 birds of 77 petrel species to estimate relative exposure risk. We identify high exposure risk areas in the Mediterranean and Black seas, and the northeast Pacific, northwest Pacific, South Atlantic and southwest Indian oceans. Plastic exposure risk varies greatly among species and populations, and between breeding and non-breeding seasons. Exposure risk is disproportionately high for Threatened species. Outside the Mediterranean and Black seas, exposure risk is highest in the high seas and Exclusive Economic Zones (EEZs) of the USA, Japan, and the UK. Birds generally had higher plastic exposure risk outside the EEZ of the country where they breed. We identify conservation and research priorities, and highlight that international collaboration is key to addressing the impacts of marine plastic on wide-ranging species
Grid box-level evaluation of IMERG over Brazil at various space and time scales
This study evaluates the performance of the Integrated Multi-satellitE Retrievals for GPM (IMERG) Final Run product over Brazil by means of multi-temporal and -spatial analyses. The assessment of the IMERG Final Run product is based on six statistics obtained for the period between January-December 2016 (daily, monthly, and annual basis). The analysis consisted of comparing the satellite-based estimates against a ground-based gridded rainfall product created using daily records from 4,911 rain gauges distributed throughout Brazil. Overall, the results show that the IMERG product can effectively capture the spatial patterns of rainfall across Brazil. However, the IMERG product presents a slight tendency in overestimating the ground-based rainfall at all timescales. Furthermore, the performance of the satellite product varies throughout the region. The higher errors and biases are found in the North and Central-West regions, but the low density of rain gauges in those regions can be a source of large deviations between IMERG estimates and observations. A large underestimation of the IMERG data is evident along the coastal zone of the Northeast region, probably due to the inability of the passive microwave and infrared sensors to detect warm-rain processes over land. This study shows that the IMERG product can be a good source of rainfall data to complement the ground precipitation measurements in most of Brazil, although some uncertainties are found and need to be further studied
Recommended from our members
Global lake responses to climate change
Climate change is one of the most severe threats to global lake ecosystems. Lake surface conditions, such as ice cover, surface temperature, evaporation and water level, respond dramatically to this threat, as observed in recent decades. In this Review, we discuss physical lake variables and their responses to climate change. Decreases in winter ice cover and increases in lake surface temperature modify lake mixing regimes and accelerate lake evaporation. Where not balanced by increased mean precipitation or inflow, higher evaporation rates will favour a decrease in lake level and surface water extent. Together with increases in extreme-precipitation events, these lake responses will impact lake ecosystems, changing water quantity and quality, food provisioning, recreational opportunities and transportation. Future research opportunities, including enhanced observation of lake variables from space (particularly for small water bodies), improved in situ lake monitoring and the development of advanced modelling techniques to predict lake processes, will improve our global understanding of lake responses to a changing climate
Global assessment of marine plastic exposure risk for oceanic birds
Plastic pollution is distributed patchily around the world’s oceans. Likewise, marine organisms that are vulnerable to plastic ingestion or entanglement have uneven distributions. Understanding where wildlife encounters plastic is crucial for targeting research and mitigation. Oceanic seabirds, particularly petrels, frequently ingest plastic, are highly threatened, and cover vast distances during foraging and migration. However, the spatial overlap between petrels and plastics is poorly understood. Here we combine marine plastic density estimates with individual movement data for 7137 birds of 77 petrel species to estimate relative exposure risk. We identify high exposure risk areas in the Mediterranean and Black seas, and the northeast Pacific, northwest Pacific, South Atlantic and southwest Indian oceans. Plastic exposure risk varies greatly among species and populations, and between breeding and non-breeding seasons. Exposure risk is disproportionately high for Threatened species. Outside the Mediterranean and Black seas, exposure risk is highest in the high seas and Exclusive Economic Zones (EEZs) of the USA, Japan, and the UK. Birds generally had higher plastic exposure risk outside the EEZ of the country where they breed. We identify conservation and research priorities, and highlight that international collaboration is key to addressing the impacts of marine plastic on wide-ranging species
Linea base de conocimientos sobre los recursos hidrologicos e hidrobiologicos en el sistema TDPS con enfoque en la cuenca del Lago Titicaca
Synthesis, Structural Characterization, and Reactivity of (8-Methoxynaphthyl)hydridogermanium Triflates and Iodides
- …