Gap winds and their effects on regional oceanography Part I: Cross Sound, Alaska

Ladd, Carol; Cheng, Wei

doi:10.1016/j.dsr2.2015.08.006

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Gap winds and their effects on regional oceanography Part I: Cross Sound, Alaska

2016
By Ladd, Carol ; Cheng, Wei
Source: Deep-Sea Research Part Ii-Topical Studies in Oceanography, 132, 41-53.

[PDF-4.90 MB]

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Journal Title:

Deep-Sea Research Part II-Topical Studies in Oceanography
Personal Author:

Ladd, Carol ; Cheng, Wei

Ladd, Carol ; Cheng, Wei Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; PMEL (Pacific Marine Environmental Laboratory) ; JISAO (Joint Institute for the Study of the Atmosphere and Ocean)

OAR (Oceanic and Atmospheric Research) ; PMEL (Pacific Marine Environmental Laboratory) ; JISAO (Joint Institute for the Study of the Atmosphere and Ocean) Less -
Description:

Gap-wind events flowing from Cross Sound in the eastern Gulf of Alaska (GOA) were examined using QuikSCAT wind data. The average duration of an event is 3.6 days with the longest event recorded in the QuikSCAT dataset being 12 days. Daily offshore directed winds with speeds > 10 m s(-1) are more common during the winter months (October-March), averaging 20.0 days per year, and less common during the summer (April - September), averaging 2.8 days per year. Interannual variability in the frequency of gap-wind events is correlated with El Nino. During gap-wind events, the spatial scales of high off-shore directed winds ( > 10 m s(-1)) reach almost 200 km off-shore and 225 km along the shelf break, suggesting that the winds directly influence both the shelf (20-65 km wide) and the off-shore waters. A model experiment suggests that a gap-wind event can result in eddy formation and changes in circulation and water properties. Increased entrainment of water from below the mixed layer due to the gap-wind event implies that mixed-layer nitrate concentrations could increase on the order of 5-10.mu mole/l, potentially enhancing primary production in the region. An accompanying paper discusses part II of our study (Ladd et al., 2016) focusing on gap-wind events in the western GOA around Kodiak Island. Published by Elsevier Ltd.
Source:

Deep-Sea Research Part Ii-Topical Studies in Oceanography, 132, 41-53.
DOI:

https://doi.org/10.1016/j.dsr2.2015.08.006
Document Type:

Journal Article
Funding:

Grant no. NA10OAR4320148
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Accepted Manuscript
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Submitted
Main Document Checksum:

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urn:sha256:c918e1e3459a97c158c5462766eb01f9576e7b2b6a4c5cce2880ae1bf8d49a26
Download URL:

https://staging-noaa.cdc.gov/view/noaa/13240/noaa_13240_DS1.pdf
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Gap winds and their effects on regional oceanography Part I: Cross Sound, Alaska

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