Details:

Journal Title:
Journal of Geophysical Research: Biogeosciences
Personal Author:
Lowman, Lauren E. L. ; Barros, Ana P.
Lowman, Lauren E. L. ; Barros, Ana P. Less -
NOAA Program & Office:
OAR (Oceanic and Atmospheric Research)
Description:
Tropical cyclones (TCs), often associated with massive flooding and landslides in the Southeast U.S. (SE U.S.), provide a significant input of freshwater to the hydrologic system, and their timing and trajectory significantly impact drought severity and persistence. This manuscript investigates the sensitivity of gross primary productivity (GPP) in the SE U.S. to TC activity using the 1‐D column implementation of the Duke Coupled Hydrology Model with Vegetation (DCHM‐V) including coupled water and energy cycles and a biochemical representation of photosynthesis. Decadal‐scale simulations of water, energy, and carbon fluxes were conducted at high temporal (30 min) and spatial (4 km) resolution over the period 2002–2012. At local scales, model results without calibration compare well against AmeriFlux tower data. At regional scales, differences between the DCHM‐V estimates and the Moderate Resolution Imaging Spectroradiometer GPP product reflect the spatial organization of soil hydraulic properties and soil moisture dynamics by physiographic region, highlighting the links between the water and carbon cycles. To isolate the contribution of TC precipitation to SE U.S. productivity, control forcing simulations are contrasted with simulations where periods of TC activity in the atmospheric forcing data were replaced with climatology. During wet years, TC activity impacts productivity in 40–50% of the SE U.S. domain and explains a regional GPP increase of 3–5 Mg C/m2 that is 9% of the warm season total. In dry years, 23–34% of the domain exhibits a smaller positive response that corresponds to 4–8% of the seasonal carbon uptake, depending on TC timing and trajectory.
Keywords:
[+]
Aquatic Science Atmospheric Science Ecology Forestry Paleontology Soil Science Water Science And Technology
Source:
Journal of Geophysical Research: Biogeosciences, 121(6), 1540-1567
DOI:
https://doi.org/10.1002/2015jg003279
ISSN:
2169-8953;2169-8961;
Format:
PDF
Publisher:
American Geophysical Union (AGU)
Document Type:
Journal Article
Funding:
Grant no. NA08OAR4310701
Rights Information:
Other
Compliance:
Library
Main Document Checksum:
[+]
urn:sha256:91110e11d16a0b411dc31450773c06a7325ed77bebea7cb1a9b612edfbabff72
Download URL:
https://repository.library.noaa.gov/view/noaa/59748/noaa_59748_DS1.pdf
File Type:

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