科技报告详细信息
Seasonal and Diurnal Opportunities for XCH4, XCO2, and XCO for the Amazonian Rainforest Region Allowing Sampling and Validation
Chatfield, Robert ; Esswein, Robert ; Dubey, Mavendra
关键词: DATA RETRIEVAL;    GOES SATELLITES;    CALIPSO (PATHFINDER SATELLITE);    METHANE;    AEROSOLS;    DIURNAL VARIATIONS;    ANNUAL VARIATIONS;    AMAZON REGION (SOUTH AMERICA);    RAIN FORESTS;    CLOUD COVER;   
RP-ID  :  ARC-E-DAA-TN67614
Subject:56.1
美国|英语
来源: NASA Technical Reports Server
PDF
【 摘 要 】
There is considerable interest in the aggregate methane emissions from the Amazon and similar moist tropical regions, and XCH4 measurements are well suited to constrain sources to the global atmosphere. Similarly, XCO2 measurements constrain CO2 in the region. XCO helps to partition CO2 patterns among burning and respiration processes. GeoCarb may allow these column measurements over the Western Hemisphere, but satellite retrieval require exacting calibration and validation by sun-focused Fourier transform spectrometers (FTS). The rarity of sufficiently large gaps in the cloud cover over the Amazon and similar rainforests restricts the validation opportunities for useful FTS observations and even more the opportunities for accurate retrievals. TropOMI observational statistics are extremely poor for the region. We have used two data sources to evaluate FTS opportunities at Manaus, Brazil, an FTS operated for 8 months near Manaus by Mavendra Dubey, and also sun-photometer measurements at several stations. The promise of using data from other satellites, e.g. GOES-16 ( (Geostationary Operational Environmental Satellite) and CALIOP (Cloud-Aerosol LIdar with Orthogonal Polarization gaps and aerosol layering will be described. We report initial results on five questions: (1) how frequent are observing opportunities of FTS?, (2) What evidence is there that gaps in clouds are wide enough for satellite retrievals at an appropriate accuracy, (3) What is the diurnal and seasonal variability of cloud gaps?, and (4) What limitations are currently suggested for unbiased FTS measurement of XCH4 due to diurnal effects, and (5) What evidence is there for incidence of problematic high aerosol extinction at higher layers of the troposphere (800 hPa to 120 hPa) which alter the XCH4 light-paths?
【 预 览 】
附件列表
Files Size Format View
20190027662.pdf 113KB PDF download
  文献评价指标  
  下载次数:13次 浏览次数:2次