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Energetic Constraints on the Intertropical Convergence Zone Position in the Observed Seasonal Cycle From Modern-Era Retrospective Analysis for Research and Applications, Version 2 (MERRA-2)

Wei, Ho-Hsuan and Bordoni, Simona (2020) Energetic Constraints on the Intertropical Convergence Zone Position in the Observed Seasonal Cycle From Modern-Era Retrospective Analysis for Research and Applications, Version 2 (MERRA-2). Geophysical Research Letters, 47 (16). Art. No. e2020GL088506. ISSN 0094-8276. https://resolver.caltech.edu/CaltechAUTHORS:20200625-123438067

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Abstract

Idealized simulations show that the approximate colocation between the ITCZ and the energy flux equator (EFE), which holds on the annual and zonal average, breaks down on subseasonal timescales, as the Hadley cell develops a shallow return flow and negative gross moist stability (GMS). Here, we explore if similar mechanisms are seen in reanalysis data. In the zonal mean, a temporal offset exists between the ITCZ and the EFE as the ITCZ is retreating from the Northern to Southern Hemisphere and the Hadley cell transports energy northward across the equator despite a northward‐shifted ITCZ. At these times, the southern cell has a bottom‐heavy structure, with a distorted cell boundary and northward energy transport. In the Eastern Pacific, while bottom‐heavy structures exist throughout the year, the bottom heaviness is stronger in boreal fall, when GMS is negative, and SSTs are weak while their Laplacian is large and negative below the ITCZ.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1029/2020GL088506DOIArticle
https://gmao.gsfc.nasa.gov/reanalysis/MERRA-2Related ItemData
https://data.caltech.edu/records/1421Related ItemData
ORCID:
AuthorORCID
Wei, Ho-Hsuan0000-0002-6201-9810
Bordoni, Simona0000-0003-4771-3350
Alternate Title:Energetic Constraints on the ITCZ position in the Observed Seasonal Cycle from MERRA-2 Reanalysis
Additional Information:© 2020 American Geophysical Union. Issue Online: 24 August 2020; Version of Record online: 24 August 2020; Accepted manuscript online: 10 August 2020; Manuscript accepted: 02 August 2020; Manuscript revised: 07 July 2020; Manuscript received: 28 April 2020. This work was supported by the National Science Foundation (AGS‐1462544). We thank Ori Adam, Andy Ingersoll, Tapio Schneider, Andrew Thompson, and Joao Teixeira for helpful discussion. Data Availability Statement: The data were originally downloaded from NASA MERRA‐2 website (https://gmao.gsfc.nasa.gov/reanalysis/MERRA‐2/) and the dry mass and MSE adjusted data are available online (https://data.caltech.edu/records/1421).
Funders:
Funding AgencyGrant Number
NSFAGS-1462544
Subject Keywords:ITCZ; energy flux equator; bottom‐heavy vertical structure; energetic constraints; seasonal cycle
Issue or Number:16
Record Number:CaltechAUTHORS:20200625-123438067
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20200625-123438067
Official Citation:Wei, H.‐H., & Bordoni, S. (2020). Energetic Constraints on the intertropical convergence zone position in the observed seasonal cycle from Modern‐Era Retrospective analysis for Research and Applications, Version 2 (MERRA‐2). Geophysical Research Letters, 47, e2020GL088506. https://doi.org/10.1029/2020GL088506
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:104059
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:25 Jun 2020 19:58
Last Modified:27 Aug 2020 20:14

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