日本地球惑星科学連合2018年大会

講演情報

[EJ] Eveningポスター発表

セッション記号 A (大気水圏科学) » A-CG 大気水圏科学複合領域・一般

[A-CG38] 北極域の科学

2018年5月24日(木) 17:15 〜 18:30 ポスター会場 (幕張メッセ国際展示場 7ホール)

コンビーナ:津滝 俊(東京大学)、漢那 直也(北海道大学 北極域研究センター)、鄭 峻介(北海道大学 北極域研究センター、共同)、中村 哲(北海道大学大学院地球環境科学研究院)

[ACG38-P04] 極向きエネルギー輸送における質量保存問題について

*春山 哲範1浮田 甚郎2本田 明治2 (1.新潟大学大学院自然科学研究科、2.新潟大学理学部)

キーワード:大気によるエネルギー輸送、質量補正

Polar amplification is one of the key climate research questions. In the context of polar amplification and global warming poleward atmospheric energy transport (AET) is of fundamental importance. Yet we are facing difficulties when we estimate changes in poleward AET. Part of the problem is the fact that any atmospheric data, re-analyses or model outputs, are subject to discrete error and uncertainties, which require a mass correction.
Here we present a new mass correction scheme and discuss the results from its applications to monthly re-analysis data of ERA-Interim and JRA55 for the period of 1979 to 2010. We found that there is much discrepancy in the stationary AET between two re-analysis products when conventional calculation is carried out without a mass correction. When we apply a new mass correction scheme, based on the area of lateral vertical wall at given latitude, this discrepancy largely disappears. We further discuss the results from trend analysis on thus corrected data.
In particular we show that at low-latitude there is a decrease in dry static energy component in monthly time-scale, which is nearly cancelled by an increases in latent heat transport. This is in comparison to a decrease in both components at high-latitude.