Multi-Decadal Change in Western US Nighttime Vapor Pressure Deficit

Chiodi, Andrew M.; Potter, Brian E.; Larkin, Narasimhan K.

doi:10.1029/2021GL092830

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Multi-Decadal Change in Western US Nighttime Vapor Pressure Deficit

2021
By Chiodi, Andrew M. ; Potter, Brian E. ; Larkin, Narasimhan K.
Source: Geophysical Research Letters, 48(15)

[PDF-1.44 MB]

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Journal Title:

Geophysical Research Letters
Personal Author:

Chiodi, Andrew M. ; Potter, Brian E. ; Larkin, Narasimhan K.

Chiodi, Andrew M. ; Potter, Brian E. ; Larkin, Narasimhan K. Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; PMEL (Pacific Marine Environmental Laboratory) ; JISAO (Joint Institute for the Study of the Atmosphere and Ocean)

OAR (Oceanic and Atmospheric Research) ; PMEL (Pacific Marine Environmental Laboratory) ; JISAO (Joint Institute for the Study of the Atmosphere and Ocean) Less -
Description:

Amid reports from western US wildland fire managers that, compared to when many started their careers, fires are burning longer throughout the day before reducing in intensity overnight, we examined decadal changes in nighttime vapor pressure deficits over the western United States with a focus on the summer fire season. We calculated changes using a recently updated observation-assimilating reanalysis (ERA5) available at hourly resolution over the 1980–2019 period. Analysis identifies the proximate cause (atmospheric temperature vs. moisture content) of the observed changes and the extent to which they have been captured in climate model simulations. Increases in nighttime vapor pressure deficits of >50% in 40 years are evident over foothills of mountains ranges adjacent to arid plateaus. The largest observed increases greatly exceed the forced climate-model response. Correlation analysis reveals a broad link between the variability of western US summer-nighttime vapor pressure deficit and the Pacific Decadal Oscillation.
Keywords:

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Vapor pressure
Source:

Geophysical Research Letters, 48(15)
DOI:

https://doi.org/10.1029/2021GL092830
Document Type:

Journal Article
Funding:

Grant no. NA15OAR4320063
Rights Information:

CC BY-NC-ND
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Submitted
Main Document Checksum:

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urn:sha256:2420f58976d9d688c73f182a50a8f227a830c3d5c8b80ca182b99e6e3c4b27ba
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https://repository.library.noaa.gov/view/noaa/32018/noaa_32018_DS1.pdf
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Multi-Decadal Change in Western US Nighttime Vapor Pressure Deficit

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