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    Recent cooling in the lower Pacific Ocean based on dynamically-consistent ocean syntheses

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    v1_covered (2).pdf
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    Type
    Preprint
    Authors
    Liao, Fanglou cc
    Zhan, Peng
    Wang, Xiao Hua
    Liu, Zhiqiang
    Hoteit, Ibrahim cc
    KAUST Department
    King Abdullah University of Science and Technology
    Earth Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2022-04-27
    Permanent link to this record
    http://hdl.handle.net/10754/676726
    
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    Abstract
    The thermal state from 1993–2017 in the lower Pacific Ocean (below 2 km) was investigated using two dynamically-consistent syntheses. We show a robust and bottom-intensified cooling. This Pacific cooling is mainly determined by the meridional heat exchange with the Southern Ocean and the vertical heat advection. The abyssal Pacific Ocean loses heat by way of westward heat advection in the northwest ocean. Mixing is found to play a negligible role. This study is to some extent consistent with a recent study that presented a deep Pacific cooling as an adjustment to the last Little Ice Age. However, it contradicts with most recent studies, which argued the abyssal Pacific Ocean was warming over the recent two decades. Our study suggests that special caution is needed when auditing variations in the deep ocean and more work is in need for a better understanding of the deep ocean state.
    Citation
    Liao, F., Zhan, P., Wang, X. H., Liu, Z., & Hoteit, I. (2022). Recent cooling in the lower Pacific Ocean based on dynamically-consistent ocean syntheses. https://doi.org/10.21203/rs.3.rs-1599666/v1
    Sponsors
    We thank the ECCO and GECCO teams for the publicly available datasets. Dr. Peter McIntyre helped to improve the manuscript. An earlier version of this manuscript was commented by Dr. Jiping Xie. We are also grateful for Hong Zhang from the Jet Propulsion Laboratory in helping with the heat budget analysis and Yang Zhang from University of Delaware for providing information about potential bias of using sparse observations in auditing the abyssal warming/cooling in the Pacific Ocean.
    Publisher
    Research Square Platform LLC
    DOI
    10.21203/rs.3.rs-1599666/v1
    Additional Links
    https://www.researchsquare.com/article/rs-1599666/v1
    ae974a485f413a2113503eed53cd6c53
    10.21203/rs.3.rs-1599666/v1
    Scopus Count
    Collections
    Preprints; Physical Science and Engineering (PSE) Division; Earth Science and Engineering Program

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