Toward a Multi-Decadal Climatology of North Pacific Polar Lows Employing Dynamical Downscaling

• Main Authors: Fei Chen, Beate Geyer, Matthias Zahn, Hans von Storch
• Format: Article in Journal/Newspaper
• Language: English
• Published: Springer 2012
• Subjects: North Pacific; Polar Low; Downscaling; Tracking algorithm; Regional climate modeling; Geology; QE1-996.5; Geophysics. Cosmic physics; QC801-809; Bering Sea; Gulf of Alaska; Pacific; Alaska
• Online Access: https://doaj.org/article/b77e99f29a0b45db97f0235a4c4ff17a

The North Pacific is an area where sub-synoptic Polar Lows frequently form during the cold season, especially over the Bering Sea, Gulf of Alaska and Japan Sea. So far, a multi-decadal climatology of such Polar Lows based on individual cases has not been assembled. Here, we consider dynamical downscaling method for realistically constructing the formation and life cycles of such lows over the past 6 decades without exploiting sub-synoptic information in initial fields. To do so, a regional climate model is conditioned by large-scale information of NCEP re-analyses. We test the approach by examining its skill in simulating ten known cases of North Pacific Polar Lows. Three of these are discussed in some detail.