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Satellite Observations of the Tropical Terrestrial Carbon Balance and Interactions With the Water Cycle During the 21st Century

Journal Article · · Reviews of Geophysics (1985)
DOI:https://doi.org/10.1029/2020rg000711· OSTI ID:1832999
 [1];  [1];  [2];  [1];  [1];  [1];  [1];  [3];  [1];  [1];  [1];  [4];  [4];  [5];  [6];  [7];  [7];  [8];  [9];  [10] more »;  [11] « less
  1. California Institute of Technology (CalTech), Pasadena, CA (United States). Jet Propulsion Lab. (JPL)
  2. California Institute of Technology (CalTech), Pasadena, CA (United States). Jet Propulsion Lab. (JPL); U.S. Department of Agriculture Forest Service International Institute of Tropical Forestry, Campinas (Brazil); EMBRAPA Agricultural Informatics, Campinas (Brazil)
  3. California Institute of Technology (CalTech), Pasadena, CA (United States). Jet Propulsion Lab. (JPL); Univ. of California, Los Angeles, CA (United States). Joint Institute for Regional Earth System Science and Engineering (JIFRESSE)
  4. Univ. of California, Los Angeles, CA (United States)
  5. California Institute of Technology (CalTech), Pasadena, CA (United States)
  6. Columbia Univ., New York, NY (United States)
  7. Stanford Univ., CA (United States)
  8. Univ. of Edinburgh (United Kingdom). National Centre for Earth Observation
  9. National Center for Atmospheric Research (NCAR), Boulder, CO (United States)
  10. Univ. of California, Los Angeles, CA (United States); Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  11. California Institute of Technology (CalTech), Pasadena, CA (United States). Jet Propulsion Lab. (JPL); Univ. of Hamburg (Germany)
A constellation of satellites are now in orbit providing information about terrestrial carbon and water storage and fluxes. These combined observations show that the tropical biosphere has changed significantly in the last two decades from the combined effects of climate variability and land use. Large areas of forest have been cleared in both wet and dry forests, increasing the source of carbon to the atmosphere. Concomitantly, tropical fire emissions have declined, at least until 2016, from changes in land-use practices and rainfall, increasing the net carbon sink. Measurements of carbon stocks and fluxes from disturbance and recovery and of vegetation photosynthesis show significant regional variability of net biosphere exchange (NBE) and gross primary productivity (GPP) across the tropics and are tied to seasonal and interannual changes in water fluxes and storage. Comparison of satellite based estimates of evapotranspiration (ET), photosynthesis, and the deuterium content of water vapor with patterns of total water storage and rainfall demonstrate the presence of vegetation-atmosphere interactions and feedback mechanisms across tropical forests. However, these observations of stocks, fluxes and inferred interactions between them do not point unambiguously to either positive or negative feedbacks in carbon and water exchanges. These ambiguities highlight the need for assimilation of these new measurements with Earth System models for a consistent assessment of process interactions, along with focused field campaigns that integrate ground, aircraft and satellite measurements, to quantify the controlling carbon and water processes and their feedback mechanisms.
Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER); National Aeronautic and Space Administration (NASA)
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
1832999
Report Number(s):
PNNL-SA-159239
Journal Information:
Reviews of Geophysics (1985), Journal Name: Reviews of Geophysics (1985) Journal Issue: 1 Vol. 59; ISSN 8755-1209
Publisher:
American Geophysical Union (AGU)Copyright Statement
Country of Publication:
United States
Language:
English

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