Assessing Surface Heat Flux Products with In Situ Observations over the Australian Sector of the Southern Ocean
Assessing Surface Heat Flux Products with In Situ Observations over the Australian Sector of the Southern Ocean
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DOI：
10.1175/jtech-d-19-0009.1
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发表时间：
2019-09-01
影响因子：
2.2
通讯作者：
Manton, Michael J.
中科院分区：
文献类型：
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作者：
Bharti, Vidhi;Schulz, Eric;Manton, Michael J.
鉴于南大洋表面热通量存在很大的不确定性，对欧洲中期天气预报中心中期再分析（ERA-Interim）产品、澳大利亚综合海洋观测系统（IMOS）常规观测以及客观分析海空热通量（OAFlux）项目混合数据集获得的通量进行了评估。表面通量是使用 COARE 3.5 批量算法以及从 NOAA 物理科学部通量系统获得的原位数据进行计算的，这些数据是在南大洋澳大利亚区（南纬 43 度 - 53 度）航行期间（2016 年 3 月至 4 月）在 R/V 调查号上进行的南大洋上空云、气溶胶、降水、辐射和大气成分 (CAPRICORN) 实验期间在 R/V 调查号上获得的现场数据。 ERA-Interim 和 OAFlux 数据进一步与在南纬 46.7 度、东经 142 度部署一年（2015 年 3 月至 2016 年 4 月）的南大洋通量站 (SOFS) 空气-海通量系泊表面浮标进行比较。结果表明，ERA-Interim（每小时 3 小时，0.25 度）和 OAFlux（每日 1 度）准确估计感热通量 H-s在 +/- 5 W m(-2) 内，潜热通量 H-l 在 +/- 10 W m(-2) 内。 ERA-Interim 在低纬度（南纬 47 度）处给出了 H-s 的正偏差，而 OAFlux 在所有纬度上都显示出一致的 H-l 正偏差。没有观察到风雨条件的系统偏差。尽管注意到总体通量算法存在一些差异，但这些偏差很大程度上可归因于用于推导通量产品的观测结果的不确定性。
Given the large uncertainties in surface heat fluxes over the Southern Ocean, an assessment of fluxes obtained by European Centre for Medium-Range Weather Forecasts interim reanalysis (ERA-Interim) product, the Australian Integrated Marine Observing System (IMOS) routine observations, and the Objectively Analyzed Air-Sea Heat Fluxes (OAFlux) project hybrid dataset is performed. The surface fluxes are calculated using the COARE 3.5 bulk algorithm with in situ data obtained from the NOAA Physical Sciences Division flux system during the Clouds, Aerosols, Precipitation, Radiation, and Atmospheric Composition over the Southern Ocean (CAPRICORN) experiment on board the R/V Investigator during a voyage (March-April 2016) in the Australian sector of the Southern Ocean (43 degrees-53 degrees S). ERA-Interim and OAFlux data are further compared with the Southern Ocean Flux Station (SOFS) air-sea flux moored surface float deployed for a year (March 2015-April 2016) at similar to 46.7 degrees S, 142 degrees E. The results indicate that ERA-Interim (3 hourly at 0.25 degrees) and OAFlux (daily at 1 degrees) estimate sensible heat flux H-s accurately to within +/- 5 W m(-2) and latent heat flux H-l to within +/- 10 W m(-2). ERA-Interim gives a positive bias in H-s at low latitudes (47 degrees S), and OAFlux displays consistently positive bias in H-l at all latitudes. No systematic bias with respect to wind or rain conditions was observed. Although some differences in the bulk flux algorithms are noted, these biases can be largely attributed to the uncertainties in the observations used to derive the flux products.