205 research outputs found
Integrating climate change impacts to improve understanding of coastal climate change: heavy rains, strong winds, and high seas in coastal Hawaii, Alaska and the Pacific Northwest
Coastal storms, and the strong winds, heavy rains, and high seas that accompany them pose a serious threat to the
lives and livelihoods of the peoples of the Pacific basin, from the tropics to the high latitudes. To reduce their
vulnerability to the economic, social, and environmental risks associated with these phenomena (and correspondingly enhance their resiliency), decision-makers in coastal communities require timely access to accurate information that affords them an opportunity to plan and respond accordingly. This includes information about the potential for coastal flooding, inundation and erosion at time scales ranging from hours to years, as well as the longterm climatological context of this information.
The Pacific Storms Climatology Project (PSCP) was formed in 2006 with the intent of improving scientific understanding of patterns and trends of storm frequency and intensity - âstorminessâ- and related impacts of these extreme events. The project is currently developing a suite of integrated information products that can be used by emergency managers, mitigation planners, government agencies and decision-makers in key sectors, including: water and natural resource management, agriculture and fisheries, transportation and communication, and recreation and tourism.
The PSCP is exploring how the climate-related processes that govern extreme storm events are expressed within and
between three primary thematic areas: heavy rains, strong winds, and high seas. To address these thematic areas,
PSCP has focused on developing analyses of historical climate records collected throughout the Pacific region, and
the integration of these climatological analyses with near-real time observations to put recent weather and climate events into a longer-term perspective.(PDF contains 4 pages
Investigating changes in global tropical cyclone storm frequency and intensity
Understanding fluctuations in tropical cyclone activity along United States shores and abroad becomes increasingly
important as coastal managers and planners seek to save lives, mitigate damage, and plan for resilience in the face of changing storminess and sea-level rise. Tropical cyclone activity has long been of concern to coastal areas as they
bring strong winds, heavy rains, and high seas. Given projections of a warming climate, current estimates suggest
that not only will tropical cyclones increase in frequency, but also in intensity (maximum sustained winds and
minimum central pressures). An understanding of what has happened historically is an important step in identifying
potential future changes in tropical cyclone frequency and intensity.
The ability to detect such changes depends on a consistent and reliable global tropical cyclone dataset. Until recently
no central repository for historical tropical cyclone data existed. To fill this need, the International Best Track
Archive for Climate Stewardship (IBTrACS) dataset was developed to collect all known global historical tropical
cyclone data into a single source for dissemination. With this dataset, a global examination of changes in tropical
cyclone frequency and intensity can be performed. Caveats apply to any historical tropical cyclone analysis
however, as the data contributed to the IBTrACS archive from various tropical cyclone warning centers is still
replete with biases that may stem from operational changes, inhomogeneous monitoring programs, and time
discontinuities. A detailed discussion of the difficulties in detecting trends using tropical cyclone data can be found
in Landsea et al. 2006.
The following sections use the IBTrACS dataset to show the global spatial variability of tropical cyclone frequency
and intensity. Analyses will show where the strongest storms typically occur, the regions with the highest number
of tropical cyclones per decade, and the locations of highest average maximum wind speeds. (PDF contains 3 pages
What is coastal climate?
Historical definitions of what determines whether one lives in a coastal area or not have varied over time. According to Culliton (1998), a âcoastal countyâ is defined as a county with at least 15% of its total land area located within a nationâs coastal watershed. This emphasizes the land areas within which water flows into the ocean or Great Lakes, but may be better suited for ecosystems or water quality research (Crowell et al. 2007). Some Federal Emergency Management Agency (FEMA) documents suggest that âcoastalâ includes shoreline-adjacent coastal counties, and perhaps even counties impacted by flooding from coastal storms. An accurate definition of âcoastalâ is critical in this regard since FEMA uses such definitions to revise and modernize their Flood Insurance Rate Maps (Crowell et al. 2007). A recent map published by the National Oceanic and Atmospheric Administrationâs (NOAA) Coastal Services Center for the Coastal Change Analysis Program shows that the âcoastalâ boundary covers the entire state of New York and Michigan, while nearly all of South Carolina is
considered âcoastal.â
The definition of âcoastalâ one chooses can have major implications, including a simple count of coastal population
and the influence of local or state coastal policies. There is, however, one aspect of defining what is âcoastalâ that
has often been overlooked; using atmospheric long-term climate variables to define the inland extent of the coastal
zone. This definition, which incorporates temperature, precipitation, wind speed, and relative humidity, is
furthermore scalable and globally applicable - even in the face of shifting shorelines. A robust definition using
common climate variables should condense the large broad definition often associated with âcoastalâ such that
completely landlocked locations would no longer be considered âcoastal.â Moreover, the resulting definition,
âcoastal climateâ or âclimatology of the coastâ, will help coastal resource managers make better-informed decisions
on a wide range of climatologically-influenced issues. The following sections outline the methodology employed to
derive some new maps of coastal boundaries in the United States. (PDF contains 3 pages
Quality Control of Pre-1948 Cooperative Observer Network Data
A recent comprehensive effort to digitize U.S. daily temperature and precipitation data observed prior to 1948 has resulted in a major enhancement in the computer database of the records of the National Weather Serviceâs cooperative observer network. Previous digitization efforts had been selective, concentrating on state or regional areas. Special quality control procedures were applied to these data to enhance their value for climatological analysis. The procedures involved a two-step process. In the first step, each individual temperature and precipitation data value was evaluated against a set of objective screening criteria to flag outliers. These criteria included extreme limits and spatial comparisons with nearby stations. The following data were automatically flagged: 1) all precipitation values exceeding 254 mm (10 in.) and 2) all temperature values whose anomaly from the monthly mean for that station exceeded five standard deviations. Addi- tional values were flagged based on differences with nearby stations; in this case, metrics were used to rank outliers so that the limited resources were concentrated on those values most likely to be invalid. In the second step, each outlier was manually assessed by climatologists and assigned one of the four following flags: valid, plausible, questionable, or invalid. In excess of 22 400 values were manually assessed, of which about 48% were judged to be invalid. Although additional manual assessment of outliers might further improve the quality of the database, the procedures applied in this study appear to have been successful in identifying the most flagrant errors
Regional Climate Trends and Scenarios for the U.S. National Climate Assessment Part 4. Climate of the U.S. Great Plains
This document is one of series of regional climate descriptions designed to provide input that can be used in the development of the National Climate Assessment (NCA). As part of a sustained assessment approach, it is intended that these documents will be updated as new and well-vetted model results are available and as new climate scenario needs become clear. It is also hoped that these documents (and associated data and resources) are of direct benefit to decision makers and communities seeking to use this information in developing adaptation plans.
There are nine reports in this series, one each for eight regions defined by the NCA, and one for the contiguous U.S. The eight NCA regions are the Northeast, Southeast, Midwest, Great Plains, Northwest, Southwest, Alaska, and Hawaiâi/Pacific Islands.
These documents include a description of the observed historical climate conditions for each region and a set of climate scenarios as plausible futures â these components are described in more detail below.
While the datasets and simulations in these regional climate documents are not, by themselves, new, (they have been previously published in various sources), these documents represent a more complete and targeted synthesis of historical and plausible future climate conditions around the specific regions of the NCA.
There are two components of these descriptions. One component is a description of the historical climate conditions in the region. The other component is a description of the climate conditions associated with two future pathways of greenhouse gas emissions
What is the Total Deuterium Abundance in the Local Galactic Disk?
Analyses of spectra obtained with the Far Ultraviolet Spectroscopic Explorer
(FUSE) satellite, together with spectra from the Copernicus and IMAPS
instruments, reveal an unexplained very wide range in the observed
deuterium/hydrogen (D/H) ratios for interstellar gas in the Galactic disk
beyond the Local Bubble. We argue that spatial variations in the depletion of
deuterium onto dust grains can explain these local variations in the observed
gas-phase D/H ratios. We present a variable deuterium depletion model that
naturally explains the constant measured values of D/H inside the Local Bubble,
the wide range of gas-phase D/H ratios observed in the intermediate regime (log
N(H I} = 19.2-20.7), and the low gas-phase D/H ratios observed at larger
hydrogen column densities. We consider empirical tests of the deuterium
depletion hypothesis: (i) correlations of gas-phase D/H ratios with depletions
of the refractory metals iron and silicon, and (ii) correlation with the
molecular hydrogen rotational temperature. Both of these tests are consistent
with deuterium depletion from the gas phase in cold, not recently shocked,
regions of the ISM, and high gas-phase D/H ratios in gas that has been shocked
or otherwise heated recently. We argue that the most representative value for
the total (gas plus dust) D/H ratio within 1 kpc of the Sun is >=23.1 +/- 2.4
(1 sigma) parts per million (ppm). This ratio constrains Galactic chemical
evolution models to have a very small deuterium astration factor, the ratio of
primordial to total (D/H) ratio in the local region of the Galactic disk, which
we estimate to be f_d <= 1.19 +/-0.16 (1 sigma) or <= 1.12 +/- 0.14 (1 sigma)
depending on the adopted light element nuclear reaction rates.Comment: 19 pages, 9 figure
Faint NUV/FUV Standards from Swift/UVOT, GALEX and SDSS Photometry
At present, the precision of deep ultraviolet photometry is somewhat limited
by the dearth of faint ultraviolet standard stars. In an effort to improve this
situation, we present a uniform catalog of eleven new faint (u sim17)
ultraviolet standard stars. High-precision photometry of these stars has been
taken from the Sloan Digital Sky Survey and Galaxy Evolution Explorer and
combined with new data from the Swift Ultraviolet Optical Telescope to provide
precise photometric measures extending from the Near Infrared to the Far
Ultraviolet. These stars were chosen because they are known to be hot (20,000 <
T_eff < 50,000 K) DA white dwarfs with published Sloan spectra that should be
photometrically stable. This careful selection allows us to compare the
combined photometry and Sloan spectroscopy to models of pure hydrogen
atmospheres to both constrain the underlying properties of the white dwarfs and
test the ability of white dwarf models to predict the photometric measures. We
find that the photometry provides good constraint on white dwarf temperatures,
which demonstrates the ability of Swift/UVOT to investigate the properties of
hot luminous stars. We further find that the models reproduce the photometric
measures in all eleven passbands to within their systematic uncertainties.
Within the limits of our photometry, we find the standard stars to be
photometrically stable. This success indicates that the models can be used to
calibrate additional filters to our standard system, permitting easier
comparison of photometry from heterogeneous sources. The largest source of
uncertainty in the model fitting is the uncertainty in the foreground reddening
curve, a problem that is especially acute in the UV.Comment: Accepted for publication in Astrophysical Journal. 31 pages, 13
figures, electronic tables available from ApJ or on reques
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