Understand the Direct Effect of CO 2 Increase on Tropical Circulation and TC Activity: Land Surface Warming Versus Direct Radiative Forcing
Abstract
Abstract The direct effect of increased CO 2 involves contributions from both land warming and direct radiative forcing. Here, their relative impacts on tropical circulation and tropical cyclones (TCs) are quantified by increasing CO 2 over land and ocean separately in a high‐resolution atmosphere‐only model. It is found that land warming induces substantial vertical velocity changes over nearby oceans and such local changes are compensated by opposite motions within tropical ascending regions. The cloud mask effect leads to smaller CO 2 ‐induced radiative heating over ascending regions. Such inhomogeneity in radiative forcing dominates compensated changes in surface fluxes and gross moist stability, leading to the slowdown of the tropical overturning circulation. TC activity is tightly linked with the large‐scale ascent because of the influence on the atmospheric humidity. Regional circulation changes caused by land warming strongly suppresses TC activity over the northwest Pacific, while weakened ascent from direct radiative forcing causes an overall TC reduction.
- Authors:
-
[1];
[2];
[3]
- Lawrence Berkeley National Lab Berkeley CA USA
- NOAA/Geophysical Fluid Dynamics Laboratory Princeton NJ USA
- Lawrence Berkeley National Lab Berkeley CA USA, College of Agricultural and Environmental Sciences University of California, Davis Davis CA USA
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1560203
- Grant/Contract Number:
- DE‐AC02‐05CH11231
- Resource Type:
- Publisher's Accepted Manuscript
- Journal Name:
- Geophysical Research Letters
- Additional Journal Information:
- Journal Name: Geophysical Research Letters Journal Volume: 46 Journal Issue: 12; Journal ID: ISSN 0094-8276
- Publisher:
- American Geophysical Union (AGU)
- Country of Publication:
- United States
- Language:
- English
Citation Formats
Zhou, Wenyu, Zhao, Ming, and Yang, Da. Understand the Direct Effect of CO 2 Increase on Tropical Circulation and TC Activity: Land Surface Warming Versus Direct Radiative Forcing. United States: N. p., 2019.
Web. doi:10.1029/2019GL082865.
Zhou, Wenyu, Zhao, Ming, & Yang, Da. Understand the Direct Effect of CO 2 Increase on Tropical Circulation and TC Activity: Land Surface Warming Versus Direct Radiative Forcing. United States. https://doi.org/10.1029/2019GL082865
Zhou, Wenyu, Zhao, Ming, and Yang, Da. Wed .
"Understand the Direct Effect of CO 2 Increase on Tropical Circulation and TC Activity: Land Surface Warming Versus Direct Radiative Forcing". United States. https://doi.org/10.1029/2019GL082865.
@article{osti_1560203,
title = {Understand the Direct Effect of CO 2 Increase on Tropical Circulation and TC Activity: Land Surface Warming Versus Direct Radiative Forcing},
author = {Zhou, Wenyu and Zhao, Ming and Yang, Da},
abstractNote = {Abstract The direct effect of increased CO 2 involves contributions from both land warming and direct radiative forcing. Here, their relative impacts on tropical circulation and tropical cyclones (TCs) are quantified by increasing CO 2 over land and ocean separately in a high‐resolution atmosphere‐only model. It is found that land warming induces substantial vertical velocity changes over nearby oceans and such local changes are compensated by opposite motions within tropical ascending regions. The cloud mask effect leads to smaller CO 2 ‐induced radiative heating over ascending regions. Such inhomogeneity in radiative forcing dominates compensated changes in surface fluxes and gross moist stability, leading to the slowdown of the tropical overturning circulation. TC activity is tightly linked with the large‐scale ascent because of the influence on the atmospheric humidity. Regional circulation changes caused by land warming strongly suppresses TC activity over the northwest Pacific, while weakened ascent from direct radiative forcing causes an overall TC reduction.},
doi = {10.1029/2019GL082865},
journal = {Geophysical Research Letters},
number = 12,
volume = 46,
place = {United States},
year = {Wed Jun 19 00:00:00 EDT 2019},
month = {Wed Jun 19 00:00:00 EDT 2019}
}
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https://doi.org/10.1029/2019GL082865
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