skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: New observational evidence for a positive cloud feedback that amplifies the Atlantic Multidecadal Oscillation: Positive Cloud Feedback Amplifies AMO

Authors:
 [1];  [2];  [2];  [3];  [1]
  1. Lamont-Doherty Earth Observatory, Columbia University, Palisades New York USA
  2. Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami Florida USA
  3. Lamont-Doherty Earth Observatory, Columbia University, Palisades New York USA, Department of Applied Physics and Applied Mathematics, Columbia University, New York New York USA
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1402136
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Geophysical Research Letters
Additional Journal Information:
Journal Volume: 43; Journal Issue: 18; Related Information: CHORUS Timestamp: 2017-10-23 16:49:07; Journal ID: ISSN 0094-8276
Publisher:
Wiley Blackwell (John Wiley & Sons)
Country of Publication:
United States
Language:
English

Citation Formats

Bellomo, Katinka, Clement, Amy C., Murphy, Lisa N., Polvani, Lorenzo M., and Cane, Mark A. New observational evidence for a positive cloud feedback that amplifies the Atlantic Multidecadal Oscillation: Positive Cloud Feedback Amplifies AMO. United States: N. p., 2016. Web. doi:10.1002/2016GL069961.
Bellomo, Katinka, Clement, Amy C., Murphy, Lisa N., Polvani, Lorenzo M., & Cane, Mark A. New observational evidence for a positive cloud feedback that amplifies the Atlantic Multidecadal Oscillation: Positive Cloud Feedback Amplifies AMO. United States. doi:10.1002/2016GL069961.
Bellomo, Katinka, Clement, Amy C., Murphy, Lisa N., Polvani, Lorenzo M., and Cane, Mark A. 2016. "New observational evidence for a positive cloud feedback that amplifies the Atlantic Multidecadal Oscillation: Positive Cloud Feedback Amplifies AMO". United States. doi:10.1002/2016GL069961.
@article{osti_1402136,
title = {New observational evidence for a positive cloud feedback that amplifies the Atlantic Multidecadal Oscillation: Positive Cloud Feedback Amplifies AMO},
author = {Bellomo, Katinka and Clement, Amy C. and Murphy, Lisa N. and Polvani, Lorenzo M. and Cane, Mark A.},
abstractNote = {},
doi = {10.1002/2016GL069961},
journal = {Geophysical Research Letters},
number = 18,
volume = 43,
place = {United States},
year = 2016,
month = 9
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1002/2016GL069961

Save / Share:
  • The Atlantic Multidecadal Oscillation (AMO) is characterized by a horseshoe pattern of sea surface temperature (SST) anomalies and has a wide range of climatic impacts. While the tropical arm of AMO is responsible for many of these impacts, it is either too weak or completely absent in many climate model simulations. Here we show, using both observational and model evidence, that the radiative effect of positive low cloud and dust feedbacks is strong enough to generate the tropical arm of AMO, with the low cloud feedback more dominant. The feedbacks can be understood in a consistent dynamical framework: weakened tropicalmore » trade wind speed in response to a warm middle latitude SST anomaly reduces dust loading and low cloud fraction over the tropical Atlantic, which warms the tropical North Atlantic SST. Together they contribute to the appearance of the tropical arm of AMO. Most current climate models miss both the critical wind speed response and two positive feedbacks though realistic simulations of them may be essential for many climatic studies related to the AMO.« less
    Cited by 15
  • Cited by 15
  • The Atlantic Multidecadal Oscillation (AMO) is characterized by a horseshoe pattern of sea surface temperature (SST) anomalies and has a wide range of climatic impacts. While the tropical arm of AMO is responsible for many of these impacts, it is either too weak or completely absent in many climate model simulations. Here we show, using both observational and model evidence, that the radiative effect of positive low cloud and dust feedbacks is strong enough to generate the tropical arm of AMO, with the low cloud feedback more dominant. The feedbacks can be understood in a consistent dynamical framework: weakened tropicalmore » trade wind speed in response to a warm middle latitude SST anomaly reduces dust loading and low cloud fraction over the tropical Atlantic, which warms the tropical North Atlantic SST. Together they contribute to the appearance of the tropical arm of AMO. Most current climate models miss both the critical wind speed response and two positive feedbacks though realistic simulations of them may be essential for many climatic studies related to the AMO.« less
  • Highlights: • Y-encoded proto-oncoprotein TSPY amplifies its expression level via a positive feedback loop. • TSPY binds to the chromatin/DNA at exon 1 of TSPY gene. • TSPY enhances the gene expression in a TSPY exon 1 sequence dependent manner. • The conserved SET/NAP-domain is essential for TSPY transactivation. • Insights on probable mechanisms on TSPY exacerbation on cancer development in men. - Abstract: The testis-specific protein Y-encoded (TSPY) is a repetitive gene located on the gonadoblastoma region of the Y chromosome, and has been considered to be the putative gene for this oncogenic locus on the male-only chromosome. Itmore » is expressed in spermatogonial cells and spermatocytes in normal human testis, but abundantly in gonadoblastoma, testicular germ cell tumors and a variety of somatic cancers, including melanoma, hepatocellular carcinoma and prostate cancer. Various studies suggest that TSPY accelerates cell proliferation and growth, and promotes tumorigenesis. In this report, we show that TSPY could bind directly to the chromatin/DNA at exon 1 of its own gene, and greatly enhance the transcriptional activities of the endogenous gene in the LNCaP prostate cancer cells. Domain mapping analyses of TSPY have localized the critical and sufficient domain to the SET/NAP-domain. These results suggest that TSPY could efficiently amplify its expression and oncogenic functions through a positive feedback loop, and contribute to the overall tumorigenic processes when it is expressed in various human cancers.« less