---
DOAJ_listed: '1'
OA_place: publisher
OA_type: gold
_id: '20319'
abstract:
- lang: eng
text: The time needed by deep convection to bring the atmosphere back to equilibrium
is called convective adjustment timescale or simply adjustment timescale, typically
denoted by . In the Community Atmospheric Model|Community Atmosphere Model (CAM), is
the convective available potential energy (CAPE) relaxation timescale and is 1 hr,
worldwide. Observational evidence suggests that is generally longer than 1 hr.
Further, continental and oceanic convection are different in terms of the vigor
of updrafts and can have different longevities. So using hour worldwide in CAM
has two potential caveats. A longer improves the simulation of the mean climate.
However, it does not address the land‐ocean heterogeneity of atmospheric deep
convection. We investigate the prescription of two different CAPE relaxation timescales
for land ( hr) and ocean ( to 4 hr). It is arguably an extremely crude parameterization
of boundary layer control on atmospheric convection. We contrast a suite of 5‐year‐long
simulations with two different for land and ocean to having one globally. The
choice of longer over ocean is guided by previous studies and inspired by observational
pieces of evidence. Nonetheless, to complement our variable experiments, we perform
a simulation with hr and hrs. Most importantly, our key findings are immune
to the exact values of prescribed and . The CAM model, with two values , improves
convective‐stratiform rainfall partitioning and the Madden–Julian oscillation
propagation characteristics.
acknowledged_ssus:
- _id: ScienComp
acknowledgement: The authors gratefully acknowledge funding from the European Research
Council (ERC) under the European Union's Horizon 2020 research and innovation program
(Project CLUSTER, Grant 805041). This research was supported by the Scientific Service
Units (SSU) of ISTA through resources provided by Scientific Computing (SciComp).
We would like to thank Prof. Courtney Schumacher and Dr. Aaron Funk of Texas A&M
University for their help in understanding the TRMM Radar data. The authors are
grateful to two anonymous reviewers who helped improve the quality of this paper.
article_number: e2025MS005035
article_processing_charge: Yes
article_type: original
author:
- first_name: BIDYUT B
full_name: GOSWAMI, BIDYUT B
id: 3a4ac09c-6d61-11ec-bf66-884cde66b64b
last_name: GOSWAMI
orcid: 0000-0001-8602-3083
- first_name: Andrea
full_name: Polesello, Andrea
id: 74c777f4-32da-11ee-b498-874db0835561
last_name: Polesello
- first_name: Caroline J
full_name: Muller, Caroline J
id: f978ccb0-3f7f-11eb-b193-b0e2bd13182b
last_name: Muller
orcid: 0000-0001-5836-5350
citation:
ama: GOSWAMI BB, Polesello A, Muller CJ. An assessment of representing land‐ocean
heterogeneity via CAPE relaxation timescale in the Community Atmospheric Model
6 (CAM6). Journal of Advances in Modeling Earth Systems. 2025;17(9). doi:10.1029/2025ms005035
apa: GOSWAMI, B. B., Polesello, A., & Muller, C. J. (2025). An assessment of
representing land‐ocean heterogeneity via CAPE relaxation timescale in the Community
Atmospheric Model 6 (CAM6). Journal of Advances in Modeling Earth Systems.
Wiley. https://doi.org/10.1029/2025ms005035
chicago: GOSWAMI, BIDYUT B, Andrea Polesello, and Caroline J Muller. “An Assessment
of Representing Land‐ocean Heterogeneity via CAPE Relaxation Timescale in the
Community Atmospheric Model 6 (CAM6).” Journal of Advances in Modeling Earth
Systems. Wiley, 2025. https://doi.org/10.1029/2025ms005035.
ieee: B. B. GOSWAMI, A. Polesello, and C. J. Muller, “An assessment of representing
land‐ocean heterogeneity via CAPE relaxation timescale in the Community Atmospheric
Model 6 (CAM6),” Journal of Advances in Modeling Earth Systems, vol. 17,
no. 9. Wiley, 2025.
ista: GOSWAMI BB, Polesello A, Muller CJ. 2025. An assessment of representing land‐ocean
heterogeneity via CAPE relaxation timescale in the Community Atmospheric Model
6 (CAM6). Journal of Advances in Modeling Earth Systems. 17(9), e2025MS005035.
mla: GOSWAMI, BIDYUT B., et al. “An Assessment of Representing Land‐ocean Heterogeneity
via CAPE Relaxation Timescale in the Community Atmospheric Model 6 (CAM6).” Journal
of Advances in Modeling Earth Systems, vol. 17, no. 9, e2025MS005035, Wiley,
2025, doi:10.1029/2025ms005035.
short: B.B. GOSWAMI, A. Polesello, C.J. Muller, Journal of Advances in Modeling
Earth Systems 17 (2025).
corr_author: '1'
date_created: 2025-09-10T05:36:16Z
date_published: 2025-09-01T00:00:00Z
date_updated: 2025-09-10T08:14:28Z
day: '01'
ddc:
- '550'
department:
- _id: CaMu
doi: 10.1029/2025ms005035
ec_funded: 1
file:
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checksum: 5961d6290432c5ac0e8587ef07f30c9b
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creator: dernst
date_created: 2025-09-10T08:12:34Z
date_updated: 2025-09-10T08:12:34Z
file_id: '20338'
file_name: 2025_JAMES_Goswami.pdf
file_size: 2143025
relation: main_file
success: 1
file_date_updated: 2025-09-10T08:12:34Z
has_accepted_license: '1'
intvolume: ' 17'
issue: '9'
language:
- iso: eng
month: '09'
oa: 1
oa_version: Published Version
project:
- _id: 629205d8-2b32-11ec-9570-e1356ff73576
call_identifier: H2020
grant_number: '805041'
name: Organization of CLoUdS, and implications of Tropical cyclones and for the
Energetics of the tropics, in current and waRming climate
publication: Journal of Advances in Modeling Earth Systems
publication_identifier:
eissn:
- 1942-2466
publication_status: published
publisher: Wiley
quality_controlled: '1'
scopus_import: '1'
status: public
title: An assessment of representing land‐ocean heterogeneity via CAPE relaxation
timescale in the Community Atmospheric Model 6 (CAM6)
tmp:
image: /images/cc_by_nc_nd.png
legal_code_url: https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode
name: Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
(CC BY-NC-ND 4.0)
short: CC BY-NC-ND (4.0)
type: journal_article
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volume: 17
year: '2025'
...