The construction of the deep-sea time variant thermohaline model in the North Pacific Ocean by combining CTD, seabed terrain and ARGO data

doi:10.13474/j.cnki.11-2246.2023.0365

Abstract

Abstract: Faced with the fact that the measured data of deep-sea temperature are insufficient, this paper redivided the experimental sea area of the North Pacific ocean according to the characteristics of CTD temperature profile changing with sea depth. Combined with the seabed terrain and Argo data, the deep-sea monthly grid temperature model of the North Pacific ocean from 2005 to 2020 is constructed,and the deep ocean steric sea level change is inversed. The experiments results show that: ①Compared with other mathematical model, the difference between the mean mathematical model of deep-sea temperature profile constructed in this paper and the measured data of CTD is 1～2 orders of magnitude smaller, which can more accurately reflect the characteristics of deep-sea temperature profiles changing with sea depth.in various regions. ②The maximum difference between temperature model data and CTD measured data, EN4 do not exceed 0.20℃ and 0.60℃, the average do not exceed 0.03℃ and 0.50℃, and the standard deviation not exceed 0.06℃ and 0.002℃.③ Based on the temperature model and EN4, the deep ocean steric sea level change in the North Pacific ocean is basically consistent, in which the rising trend from 2005 to 2010 is 0.52±0.09 and 0.73±0.11 mm/a, and the rising trend from 2010 to 2020 is 0.02±0.03 and -0.01±0.01 mm/a,which is consistent with the research conclusion based on heat content change in relevant literature.The rising trend in the whole study period is 0.11±0.17 and 0.09±0.11 mm/a. This shows that the temperature model data constructed in this paper has a certain reliability, which have a certain reference value for refining the genetic changes of regional sea level balance equation.

Key words: CTD, deep-sea, thermohaline area, model construction, deep ocean steric sea level change

CLC Number:

P229

ZHANG Jinhui, LI Shanshan, YANG Guang, FAN Diao, LING Qing. The construction of the deep-sea time variant thermohaline model in the North Pacific Ocean by combining CTD, seabed terrain and ARGO data[J]. Bulletin of Surveying and Mapping, 2023, 0(12): 94-101,126.

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