DOI: 10.1002/2013GB004712
Scopus记录号: 2-s2.0-84892376405
论文题名: Influence of precipitation events on phytoplankton biomass in coastal waters of the eastern United States
作者: Kim T ; -W ; , Najjar R ; G ; , Lee K
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2014
卷: 28, 期: 1 起始页码: 1
结束页码: 13
语种: 英语
英文关键词: atmospheric nitrogen deposition
; chlorophyll a
; phytoplankton biomass
; precipitation
; U.S. East Coast
; wind speed
Scopus关键词: Biomass
; Chlorophyll
; Ecology
; Nitrogen
; Phytoplankton
; Precipitation (chemical)
; Productivity
; Water pollution
; Wind
; Atmospheric nitrogen deposition
; Chlorophyll a
; East coast
; Phytoplankton biomass
; Wind speed
; Nutrients
; biomass
; chlorophyll a
; coastal water
; concentration (composition)
; mixed layer
; nitrate
; phytoplankton
; precipitation (climatology)
; satellite data
; sea surface
; wind velocity
; United States
英文摘要: Precipitation over the ocean surface in the vicinity of industrialized and populated coastlines can increase the ocean nitrate concentration and consequently enhance ocean primary productivity. Using satellite data and a meteorological reanalysis product, we evaluated the impact of precipitation events on the chlorophyll a concentration in coastal and offshore waters located downwind of the eastern United States. We found that in low-nutrient areas (defined as having nitrate concentrations < 1 μM) precipitation events were associated with increased levels of chlorophyll a (up to approximately 15%), but in high-nutrient areas (nitrate concentrations > 1 μM) they were associated with decreased levels. These contrasting responses of chlorophyll a concentration to precipitation were attributed to the correlation of precipitation with wind speed and to other factors (nutrients and light) limiting phytoplankton growth. Increases in wind speed accompanied by precipitation events typically deepen the mixed layer, which can entrain additional nutrients into the mixed layer but simultaneously reduce light availability. We suggest that in nutrient-depleted areas (south of 36°N) the added nutrients were a dominant factor increasing the chlorophyll a concentration, whereas in the nutrient-replete areas (north of 36°N), where phytoplankton growth was light limited, reduced light availability was the dominant factor determining reduced chlorophyll a concentration. Our results indicate that an increase in wind speed accompanied by precipitation events was a major contributor to the observed changes in chlorophyll a concentration during wet days, whereas the wet deposition of pollutant nitrogen slightly increased the chlorophyll a concentration (< 5%) only in nutrient-depleted areas. Key Points Precipitation considerably enhanced phytoplankton biomass in low-nutrient area Increase in wind speed during wet day was a major factor increasing productivity The atmospheric N deposition was less important in increasing productivity ©2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77474
Appears in Collections: 气候变化事实与影响
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作者单位: School of Environmental Science and Engineering, Pohang University of Science and Technology, Pohang, South Korea; Now at Ocean Circulation and Climate Research Division, Korea Institute of Ocean Science and Technology, Ansan, South Korea; Department of Meteorology, Pennsylvania State University, University Park, PA, United States
Recommended Citation:
Kim T,-W,, Najjar R,et al. Influence of precipitation events on phytoplankton biomass in coastal waters of the eastern United States[J]. Global Biogeochemical Cycles,2014-01-01,28(1)