The Impact of Sea-Ice Loss on Arctic Climate Feedbacks and Their Role for Arctic Amplification

Jenkins, Matthew; Dai, Aiguo

doi:10.1029/2021GL094599

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The Impact of Sea-Ice Loss on Arctic Climate Feedbacks and Their Role for Arctic Amplification

2021
By Jenkins, Matthew ; Dai, Aiguo
Source: Geophysical Research Letters 48(15): e2021GL094599

[PDF-1.30 MB]

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Details:

Journal Title:

Geophysical Research Letters
Personal Author:

Jenkins, Matthew ; Dai, Aiguo

Jenkins, Matthew ; Dai, Aiguo Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; CPO (Climate Program Office)

OAR (Oceanic and Atmospheric Research) ; CPO (Climate Program Office) Less -
Description:

Sea-ice loss and radiative feedbacks have been proposed to explain Arctic amplification (AA)—the enhanced Arctic warming under increased greenhouse gases, but their relationship is unclear. By analyzing coupled CESM1 simulations with 1%/year CO2 increases, we show that without large sea-ice loss and AA, the lapse rate, Planck, and surface albedo feedbacks are greatly reduced, while the positive water vapor feedback changes little. The positive Arctic lapse rate feedback, which results from enhanced surface warming rather than the high stability of Arctic air, and changes in atmospheric energy transport across the Arctic Circle are a result, not a cause, of AA; while the water vapor feedback also plays a minor role. Instead, AA results from enhanced winter oceanic heating associated with sea-ice loss that is aided by a positive surface albedo feedback in summer and positive cloud feedback in winter.
Keywords:

[+]

Climatology Greenhouse Gases Sea Ice
Source:

Geophysical Research Letters 48(15): e2021GL094599
DOI:

https://doi.org/10.1029/2021GL094599
Document Type:

Journal Article
Funding:

Grant no. NA18OAR4310425
Place as Subject:

Arctic regions
Rights Information:

Other
Compliance:

Submitted
Main Document Checksum:

[+]

urn:sha256:c9f44dc4efbde7a106bcf6976cbbd08c7c5a92dae1909d4c41f8d49b2b5a5568
Download URL:

https://repository.library.noaa.gov/view/noaa/44717/noaa_44717_DS1.pdf
File Type:

Available dataset

htm

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