A volume-conserved approach to estimating sea-ice production in antarctic polynyas ...

• Main Authors: Lin, Yichen, Yang, Qinghua, Qian, Shi, Yoshihiro, Nakayama, Dake, Chen
• Format: Conference Object
• Language: unknown
• Published: GFZ German Research Centre for Geosciences 2023
• Subjects: Antarctic; Ross Sea; Antarc*; Sea ice
• Online Access: https://dx.doi.org/10.57757/iugg23-2892; https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018974

<!--!introduction!--> Polynyas, the regions of open water or thin sea-ice surrounded by thicker sea-ice, are sources of Antarctic Bottom Water (AABW), due to the strong buoyance loss and sea-ice production here. Accurate estimation of sea-ice production (SIP) is crucial to understanding the AABW formation. Polynyas can be classified into sensible-heat and latent-heat polynyas resulting from their formation and sustainable mechanism. With an unrealistic assumption of zero sub-ice oceanic heat flux, previous estimations of SIP based on the heat-budget method are mainly limited to latent-heat polynyas. In this study, based on the sea-ice volume-conservation (VC) theory, we developed a new method that can consider cases with sea-ice melting (negative SIP). Moreover, using this method, we estimate the ice–ocean heat flux via satellite observations combined with atmospheric reanalysis data indirectly for the first time. For a latent-heat polynya—the Ross Sea Polynya—this method captures the synoptic SIP ... : The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) ...