DOI: 10.1002/2015GL063040
论文题名: The fertilizing role of African dust in the Amazon rainforest: A first multiyear assessment based on data from Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
作者: Yu H. ; Chin M. ; Yuan T. ; Bian H. ; Remer L.A. ; Prospero J.M. ; Omar A. ; Winker D. ; Yang Y. ; Zhang Y. ; Zhang Z. ; Zhao C.
刊名: Geophysical Research Letters
ISSN: 0094-8836
EISSN: 1944-8567
出版年: 2015
卷: 42, 期: 6 起始页码: 1984
结束页码: 1991
语种: 英语
英文关键词: Amazon rainforest
; biogeochemical cycle
; CALIPSO
; dust deposition
; phosphorus
; satellite remote sensing
Scopus关键词: Aerosols
; Biogeochemistry
; Deposition
; Optical radar
; Phosphorus
; Remote sensing
; Satellites
; Amazon rain forest
; Biogeochemical cycle
; CALIPSO
; Dust deposition
; Satellite remote sensing
; Dust
; aerosol
; lidar
; meridional circulation
; phosphorus
; rainforest
; satellite imagery
; timescale
; transport process
; Africa
; Amazonia
英文摘要: The productivity of the Amazon rainforest is constrained by the availability of nutrients, in particular phosphorus (P). Deposition of long-range transported African dust is recognized as a potentially important but poorly quantified source of phosphorus. This study provides a first multiyear satellite-based estimate of dust deposition into the Amazon Basin using three-dimensional (3-D) aerosol measurements over 2007-2013 from the Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP). The 7year average of dust deposition into the Amazon Basin is estimated to be 28 (8-48)Tga-1 or 29 (8-50)kgha-1a-1. The dust deposition shows significant interannual variation that is negatively correlated with the prior-year rainfall in the Sahel. The CALIOP-based multiyear mean estimate of dust deposition matches better with estimates from in situ measurements and model simulations than a previous satellite-based estimate does. The closer agreement benefits from a more realistic geographic definition of the Amazon Basin and inclusion of meridional dust transport calculation in addition to the 3-D nature of CALIOP aerosol measurements. The imported dust could provide about 0.022(0.006-0.037)TgP of phosphorus per year, equivalent to 23 (7-39)gPha-1a-1 to fertilize the Amazon rainforest. This out-of-basin phosphorus input is comparable to the hydrological loss of phosphorus from the basin, suggesting an important role of African dust in preventing phosphorus depletion on timescales of decades to centuries. Key Points About 28 Tg of Saharan dust is deposited into the Amazon yearly African dust plays an important role in preventing phosphorus depletion Ambiguity and inconsistency in model-observation comparison is clarified ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84927800186&doi=10.1002%2f2015GL063040&partnerID=40&md5=63cc2043ca6b32beb568adb5726266b6
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8452
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD, United States
Recommended Citation:
Yu H.,Chin M.,Yuan T.,et al. The fertilizing role of African dust in the Amazon rainforest: A first multiyear assessment based on data from Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations[J]. Geophysical Research Letters,2015-01-01,42(6).