English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
 
 
DownloadE-Mail
  Quantifying convective aggregation using the tropical moist margin's length

Beucler, T., Leutwyler, D., & Windmiller, J. (2020). Quantifying convective aggregation using the tropical moist margin's length. Journal of Advances in Modeling Earth Systems, e2020MS002092, pp. acc. article online. doi:10.1029/2020MS002092.

Item is

Basic

show hide
Genre: Journal Article

Files

show Files
hide Files
:
2020MS002092.pdf (Publisher version), 4MB
Name:
2020MS002092.pdf
Description:
-
Visibility:
Public
MIME-Type / Checksum:
application/pdf / [MD5]
Technical Metadata:
Copyright Date:
2020
Copyright Info:
The Authors

Locators

show
hide
Locator:
https://github.com/tbeucler/2019_WMI (Supplementary material)
Description:
Wird später zu Archiv für PuRe zusammengefasst, wenn angenommen.

Creators

show
hide
 Creators:
Beucler, Tom, Author
Leutwyler, David1, Author
Windmiller, Julia1, Author              
Affiliations:
1Precipitating Convection, The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society, ou_3001851              

Content

show
hide
Free keywords: -
 Abstract: On small scales, the tropical atmosphere tends to be either moist or very dry. This denes two states that, on large scales, are separated by a sharp margin, well identied by the antimode of the bimodal tropical column water vapor distribution. Despite recent progress in understanding physical processes governing the spatiotemporal variability of tropical water vapor, the behavior of this margin remains elusive, and we lack a simple framework to understand the bimodality of tropical water vapor in observations. Motivated by the success of coarsening theory in explaining bimodal distributions, we leverage its methodology to relate the moisture eld's spatial organization to its time evolution. This results in a new diagnostic framework for the bimodality of tropical water vapor, from which we argue that the length of the margin separating moist from dry regions should evolve toward a minimum in equilibrium. As the spatial organization of moisture is closely related to the organization of tropical convection, we hereby introduce a new convective organization index (BLW) measuring the ratio of the margin's length to the circumference of a welldened equilibrium shape. Using BLW, we assess the evolution of selfaggregation in idealized cloudresolving simulations of radiativeconvective equilibrium and contrast it to the time evolution of the Atlantic Intertropical Convergence Zone (ITCZ) in the ERA5 meteorological reanalysis product. We nd that BLW successfully captures aspects of convective organization ignored by more traditional metrics, while offering a new perspective on the seasonal cycle of convective organization in the Atlantic ITCZ

Details

show
hide
Language(s): eng - English
 Dates: 2020-022020-08-252020-102020-10
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1029/2020MS002092
arXiv: 2002.11301
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Journal of Advances in Modeling Earth Systems
  Alternative Title : JAMES
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Washington, D.C. : American Geophysical Union
Pages: - Volume / Issue: - Sequence Number: e2020MS002092 Start / End Page: acc. article online Identifier: n.a.: /journals/resource/19422466