Estimates of Near-Inertial Wind Power Input Using Novel In Situ Wind Measurements from Minimet Surface Drifters in the Iceland Basin
Estimates of Near-Inertial Wind Power Input Using Novel In Situ Wind Measurements from Minimet Surface Drifters in the Iceland Basin
复制标题
使用冰岛盆地小型表面漂流器的新型现场风测量估算近惯性风功率输入
DOI：
10.1175/jpo-d-21-0283.1
复制
发表时间：
2022
影响因子：
3.5
通讯作者：
Hormann, Verena
中科院分区：
文献类型：
--
作者：
Klenz, Thilo;Simmons, Harper L.;Centurioni, Luca;Lilly, Jonathan M.;Early, Jeffrey J.;Hormann, Verena
Minimet是一种拉格朗日表面漂移仪，在现场测量近地面风。在2018年和2019年的两个现场季节中，在冰岛盆地部署了10个Minimets。我们将Minimets的风测量值与R/ varmstrong气象学包中的同步船舶风和每小时ERA5再分析风进行了比较，发现Minimets准确地捕获了各种时间尺度上的风变化。船舶风、minimites风和ERA5风之间的比较表明，现场风测量值与ERA5之间存在显著差异，最合理的解释是与再分析模型中小尺度风暴结构的空间偏移有关。在对Minimet性能进行一般评估后，我们比较了使用Minimet风及其测量漂移的近惯性波段风电输入估计与使用ERA5风和Minimet漂移的估计。Minimet导出的近惯性风力估计比Minimet漂移结合ERA5风的估计高出约42%。结果强调了准确捕获小尺度、高频风事件的重要性，并表明原位Minimet测量有助于准确量化海洋上的近惯性风工作。在本研究中，我们介绍了一种新型的自由漂移风测量平台Minimet。在初步验证了Minimet海面风测量值与附近一艘研究船的独立风测量值之后，我们研究了它们在风对海洋所做的近惯性功背景下的效用，这对海洋的能量收支很重要。我们发现，最小近惯性风功估计比使用最先进风力产品的风的估计高出42%。我们的研究结果表明，捕捉在不到12小时的时间尺度上发生的风暴事件对于准确量化海洋上的近惯性风工作至关重要，这使得Minimet等平台的风测量对这些分析非常宝贵。
The Minimet is a Lagrangian surface drifter measuring near-surface winds in situ. Ten Minimets were deployed in the Iceland Basin over the course of two field seasons in 2018 and 2019. We compared Minimet wind measurements to coincident ship winds from the R/VArmstrongmeteorology package and to hourly ERA5 reanalysis winds and found that the Minimets accurately captured wind variability across a variety of time scales. Comparisons between the ship, Minimets, and ERA5 winds point to significant discrepancies between the in situ wind measurements and ERA5, with the most reasonable explanation being related to spatial offsets of small-scale storm structures in the reanalysis model. After a general assessment of the Minimet performance, we compare estimates of wind power input in the near-inertial band using the Minimet winds and their measured drift to those using ERA5 winds and the Minimet drift. Minimet-derived near-inertial wind power estimates exceed those from Minimet drift combined with ERA5 winds by about 42%. The results highlight the importance of accurately capturing small-scale, high-frequency wind events and suggest that in situ Minimet measurements are beneficial for accurately quantifying near-inertial wind work on the ocean.Significance StatementIn this study we introduce a novel, freely drifting wind measurement platform, the Minimet. After an initial validation of Minimet sea surface wind measurements against independent wind measurements from a nearby research vessel, we investigate their utility in context of the near-inertial work done by the wind on the ocean, which is important for the ocean’s energy budget. We find Minimet near-inertial wind work estimates exceed those estimated using winds from a state-of-the-art wind product by 42%. Our results indicate that capturing storm events happening on time scales less than 12 h is crucial for accurately quantifying near-inertial wind work on the ocean, making wind measurements from platforms such as the Minimet invaluable for these analyses.