永兴岛涡动相关数据处理与质量评价*

doi:10.11978/2016124

Abstract

Abstract:

This study was based on the raw eddy-covariance (EC) data measured in February 2016 from the observation tower on Yongxing Island. EddyPro software was used for data post-processing, and the influence on flux calculation was quantitatively analyzed before and after each processing step. Furthermore, flux data quality classification, footprint analysis and comparison with calculated results using easyflux_dl real time programme were conducted. The results showed that despiking, coordinate rotation, frequency response correction and density correction all influenced the flux calculation result to different degrees. The influences of coordinate rotation on momentum flux, latent heat flux and carbon dioxide flux were evident, which revealed increases of 11.28%, 7.36% and 18.53%, respectively. The density correction had a significant effect on the carbon dioxide flux calculation, which was reduced by 7.87% after density correction. Comprehensive quality evaluation results revealed that the ratios of high quality data (grades 1~3) of momentum flux, sensible heat flux, latent heat flux, and carbon dioxide flux were 90.29%, 90.22%, 88.46%, and 85.41%, respectively. Footprint analysis showed that 72.04% source area of the flux was scattered in the first interesting area (10~80°, the underlying surface is the ocean surface with an average water depth of more than 10 m). Comparison of flux calculation results between EddyPro and EasyFlux showed that the two flux time series were fundamentally consistent; the results obtained by EddyPro were smaller but more reliable and accurate due to more strict despiking adopted to get rid of outliers’ impacts.

Key words: Yongxing Island observation tower, eddy-convariance, air-sea flux, data processing, data quality evaluation

CLC Number:

P413

Fenghua ZHOU, Rongwang ZHANG, Rui SHI, Yunkai HE, Ju CHEN, Dongxiao WANG, Qiang XIE. A study of data processing and quality assessment of the eddy convariance system off Yongxing Island[J].Journal of Tropical Oceanography, 2017, 36(4): 48-59.

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设备(型号)	采样频率/Hz	数据表间隔/min	观测项目	安装高度/m
风速传感器(Young 05106)	1	1、10、30	4层风速风向	5、10、15、20
温湿度传感器(Vaisala HMP155A) Vaisala HMP155A	1	1、10、30	4层温湿度	5、10、15、20
四分量辐射仪(Hukseflux NR01)	1	1、10、30	向上、向下; 短波和长波辐射	8
海表红外温度计(CSI SI-111)	1	1、10、30	下垫面海表温度	10
涡动相关仪(CSAT3 & EC150)	10	30	感热、潜热、动量、二氧化碳通量	12

质量等级	IST/%
1	0~15
2	16~30
3	31~50
4	51~75
5	76~100
6	101~250
7	251~500
8	501~1000
9	>1000

质量等级	ITC/%
1	0~15
2	16~30
3	31~50
4	51~75
5	76~100
6	101~250
7	251~500
8	501~1000
9	>1000

等级	IST/%	ITC/%
1	0~15	0~30
2	16~30	0~30
3	0~30	31~75
4	31~75	0~30
5	0~75	31~100
6	76~100	0~100
7	0~250	0~250
8	0~1000	0~1000
9	>1000	>1000

A study of data processing and quality assessment of the eddy convariance system off Yongxing Island

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