کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9456389 | 1309193 | 2005 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Improved daily precipitation nitrate and ammonium concentration models for the Chesapeake Bay Watershed
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم محیط زیست
شیمی زیست محیطی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Improved daily precipitation nitrate and ammonium concentration models for the Chesapeake Bay Watershed Improved daily precipitation nitrate and ammonium concentration models for the Chesapeake Bay Watershed](/preview/png/9456389.png)
چکیده انگلیسی
Daily precipitation nitrate and ammonium concentration models were developed for the Chesapeake Bay Watershed (USA) using a linear least-squares regression approach and precipitation chemistry data from 29 National Atmospheric Deposition Program/National Trends Network (NADP/NTN) sites. Only weekly samples that comprised a single precipitation event were used in model development. The most significant variables in both ammonium and nitrate models included: precipitation volume, the number of days since the last event, a measure of seasonality, latitude, and the proportion of land within 8Â km covered by forest or devoted to industry and transportation. Additional variables included in the nitrate model were the proportion of land within 0.8Â km covered by water and/or forest. Local and regional ammonia and nitrogen oxide emissions were not as well correlated as land cover. Modeled concentrations compared very well with event chemistry data collected at six NADP/AirMoN sites within the Chesapeake Bay Watershed. Wet deposition estimates were also consistent with observed deposition at selected sites. Accurately describing the spatial distribution of precipitation volume throughout the watershed is important in providing critical estimates of wet-fall deposition of ammonium and nitrate.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Environmental Pollution - Volume 135, Issue 3, June 2005, Pages 445-455
Journal: Environmental Pollution - Volume 135, Issue 3, June 2005, Pages 445-455
نویسندگان
J.W. Grimm, J.A. Lynch,