搜索结果: 16-30 共查到“理学 North America”相关记录30条 . 查询时间(0.168 秒)
Hydrologic effects of land and water management in North America and Asia：1700–1992
water management North America
2009/5/7
The hydrologic effects of land use changes, dams, and irrigation in North America and Asia over the past 300 years are studied using a macroscale hydrologic model. The simulation results indicate that...
Assessment of impact of climate change on water resources：a long term analysis of the Great Lakes of North America
Global Circulation Models the Great Lakes climate change
2009/4/28
In the threshold of the appearance of global warming from theory to reality, extensive research has focused on predicting the impact of potential climate change on water resources using results from G...
Increasing ozone in marine boundary layer inflow at the west coasts of North America and Europe
ozone marine boundary layer west coasts North America Europe
2009/3/13
An effective method is presented for determining the ozone (O3) mixing ratio in the onshore flow of marine air at the North American west coast. By combining the data available from all marine boundar...
A numerical modelling study on regional mercury budget for eastern North America
numerical modelling regional mercury budget eastern North America
2009/3/10
In this study, we have integrated an up-to-date physio-chemical transformation mechanism of Hg into the framework of US EPA's CMAQ model system. In addition, the model adapted detailed calculations of...
Wind Stress on the Ocean over the Eastern Continental Shelf of North America
Wind Stress North America Eastern Continental Shelf
2009/3/7
In the summer season the 32-year climatological wind stress is toward the northeast, having a magnitude close to 0.25 dyn cm−2 throughout the entire shelf region. In the three other seasons the ...
Monthly Mean Sea-Level Variability Along the West Coast of North America
Monthly Mean Sea-Level Variability North America West Coast
2009/2/8
Linear statistical estimators are used to examine 29 years of nonseasonal, monthly-mean, tide-gauge sea-level data along the west coast of North America. The objective is exploration of the structure,...
Large-Scale Sea Level Response to Atmospheric Forcing along the West Coast of North America, Summer 1973
sea level North America
2009/1/20
Along the west Coast of North America, the response of sea level to fluctuations in alongshore wind stress at large alongshore scales (> 1000 km) accounted for a substantial faction of the total sea l...
A Coupled Hydrodynamic–Bottom Boundary Layer Model of Storm and Tidal Flow in the Middle Atlantic Bight of North America
Middle Atlantic Bight Hydrodynamic–Bottom Boundary Layer Model Tidal Flow
2008/12/11
The effects of increased friction and tides on circulation in the Middle Atlantic Bight (MAB) during the SWADE storm of 25–28 October 1990 have been investigated using a three-dimensional hydrodynamic...
Air quality in North America's most populous city – overview of the MCMA-2003 campaign
Air quality North America
2008/12/10
Exploratory field measurements in the Mexico City Metropolitan Area (MCMA) in February 2002 set the stage for a major air quality field measurement campaign in the spring of 2003 (MCMA-2003). Involvin...
Transpacific transport of ozone pollution and the effect of recent Asian emission increases on air quality in North America: an integrated analysis using satellite, aircraft, ozonesonde, and surface observations
ozone pollution Asian emission North America
2008/11/24
We use an ensemble of aircraft, satellite, sonde, and surface observations for April–May 2006 (NASA/INTEX-B aircraft campaign) to better understand the mechanisms for transpacific ozone pollution and ...
Interpreting the variability of space-borne CO2 column-averaged volume mixing ratios over North America using a chemistry transport model
space-borne CO2 North America chemistry transport model
2008/11/21
We use the GEOS-Chem chemistry transport model to interpret the sources and sinks of CO2 that determine variability of column-averaged volume mixing ratios (CVMRs), as observed by the SCIAMACHY satell...
Predicting Pleistocene climate from vegetation in North America
pleistocene climate vegetation North America
2008/11/4
Climates at the Last Glacial Maximum have been inferred from fossil pollen assemblages, but these inferred climates are colder for eastern North America than those produced by climate simulations. It ...
Physical and chemical predictors of diatom dissolution in freshwater and saline lake sediments in North America and West Greenland
Physical and chemical predictors diatom dissolution in freshwater saline lake sediments North America West Greenland
2014/5/4
Diatom dissolution in surface sediment samples from two regional lake datasets in the Northern Great Plains (NGP; n = 64) and West Greenland (n = 40) is assessed using a morphological approach categor...
A synthesis of ENSO effects on drylands in Australia, North America and South America
ENSO effects drylands Australia, North America and South America
2010/1/25
Fundamentally, El Niño Southern Oscillation (ENSO) is a climatic and oceanographic phenomenon, but it has profound effects on terrestrial ecosystems. Although the ecological effects of ENSO are...
Origin and Clay-Mineral Genesis of the Cretaceous/Tertiary Boundary Unit, Western Interior of North America
Claystone Ejecta Glass alteration Halloysite Kaolinite K/T boundary unit Meteorite impact SEM XRD
2011/12/1
Abstract: A 3-cm-thick, two-layered clay unit that records mineralogic and textural evidence of a catastrophic event that occurred at a time now marked as the end of the Cretaceous Period was preserve...