Understanding Full‐Depth Steric Sea Level Change in the Southwest Pacific Basin Using Deep Argo

Details

• Journal Title:
  Geophysical Research Letters
• Personal Author:
  Lele, Ratnaksha ; Purkey, Sarah G.
• NOAA Program & Office:
  OAR (Oceanic and Atmospheric Research)
• Description:
  Using 9  years of full‐depth profiles from 55 Deep Argo floats in the Southwest Pacific Basin collected between 2014 and 2023, we find consistent warm anomalies compared to a long‐term climatology below 2,000 m ranging between 11 ± 2 to 34 ± 2 m°C, most pronounced between 3,500 and 5,000 m. Over this period, a cooling trend is found between 2,000 and 4,000 m and a significant warming trend below 4,000 m with a maximum rate of 4.1 ± 0.31 m°C yr−1 near 5,000 m, with a possible acceleration over the second half of the period. The integrated Steric Sea Level expansion below 2,000 m was 7.9 ± 1 mm compared to the climatology with a trend of 1.3 ± 1.6 mm dec−1 over the Deep Argo era, contributing significantly to the local sea level budget. We assess the ability to close a full Sea Level Budget, further demonstrating the value of a full‐depth Argo array.
• Source:
  Geophysical Research Letters, 51(12)
• DOI:
  https://doi.org/10.1029/2023GL107844
• ISSN:
  0094-8276 ; 1944-8007
• Format:
  PDF
• Publisher:
  American Geophysical Union (AGU)
• Document Type:
  Journal Article
• Funding:
  Grant no. NA20OAR4320278
• License:
  https://creativecommons.org/licenses/by/4.0/
• Rights Information:
  CC BY
• Compliance:
  Submitted
• Main Document Checksum:
  urn:sha-512:7201765f9456c3b7839697e826faa763fbfda6463c6d835db579e7821bb42a7c94093add1896feed86d109c7deb260e0ff3aca48258bb8adf1b8dd3241c65533
• Download URL:
  https://repository.library.noaa.gov/view/noaa/70175/noaa_70175_DS1.pdf
• File Type:
  [PDF - 1.52 MB ]