DOI: 10.1029/2018GB005990
论文题名: Global Estimates of Inorganic Nitrogen Deposition Across Four Decades
作者: Ackerman D. ; Millet D.B. ; Chen X.
刊名: Global Biogeochemical Cycles
ISSN: 0886-6236
EISSN: 1944-9224
出版年: 2019
卷: 33, 期: 1 语种: 英语
英文关键词: atmospheric deposition
; estimation method
; global perspective
; inorganic nitrogen
; model
; nitrogen cycle
; spatial resolution
; trend analysis
; Brazil
; Far East
; United States
学科: atmospheric deposition
; chemical transport model
; nitrogen
中文摘要: Atmospheric deposition of inorganic nitrogen is critical to the function of ecosystems and elemental cycles. During the industrial period, humans have doubled the amount of inorganic nitrogen in the biosphere and radically altered rates of atmospheric nitrogen deposition. Despite this rapid change, estimates of global nitrogen deposition patterns generally have low, centennial-scale temporal resolution. Lack of information on annual- to decadal-scale changes in global nitrogen deposition makes it difficult for scientists researching questions on these finer timescales to contextualize their work within the global nitrogen cycle. Here we use the GEOS-Chem Chemical Transport Model to estimate wet and dry deposition of inorganic nitrogen globally at a spatial resolution of 2° × 2.5° for 12 individual years in the period from 1984 to 2016. During this time, we found an 8% increase in global inorganic nitrogen deposition from 86.6 to 93.6 TgN/year, a trend that comprised a balance of variable regional patterns. For example, inorganic nitrogen deposition increased in areas including East Asia and Southern Brazil, while inorganic nitrogen deposition declined in areas including Europe. Further, we found a global increase in the percentage of inorganic nitrogen deposited in chemically reduced forms from 30% to 35%, and this trend was largely driven by strong regional increases in the proportion of chemically reduced nitrogen deposited over the United States. This study provides spatially explicit estimates of inorganic nitrogen deposition over the last four decades and improves our understanding of short-term human impacts on the global nitrogen cycle. ©2018. 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/160167
Appears in Collections: 气候变化与战略
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作者单位: Department of Ecology, Evolution, and Behavior, University of Minnesota, St. Paul, MN, United States; Department of Soil, Water, and Climate, University of Minnesota, St. Paul, MN, United States
Recommended Citation:
Ackerman D.,Millet D.B.,Chen X.. Global Estimates of Inorganic Nitrogen Deposition Across Four Decades[J]. Global Biogeochemical Cycles,2019-01-01,33(1)