Comparison of gravity wave temperature variances from ray-based spectral parameterization of convective gravity wave drag with AIRS observations
Comparison of gravity wave temperature variances from ray-based spectral parameterization of convective gravity wave drag with AIRS observations
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DOI：
10.1029/2011jd016900
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发表时间：
2012-03-08
影响因子：
4.4
通讯作者：
Wu, Dong L.
中科院分区：
文献类型：
--
作者：
Choi, Hyun-Joo;Chun, Hye-Yeong;Wu, Dong L.
基于射线的对流重力波阻力谱参数化的真实性，考虑了对流源的更新移动速度和多个波传播方向，通过 Aqua 卫星上的大气红外探测器 (AIRS) 进行了测试。使用2005年1月和7月的全球再分析数据进行离线参数化计算，并在z = 2.5 hPa（未过滤的GWTV）下计算重力波温度方差（GWTV）。 AIRS 过滤后的 GWTV 直接与 AIRS 进行比较，是通过将 AIRS 可见性函数应用于未过滤的 GWTV 来计算的。参数化计算与 AIRS 观测结果的比较表明，AIRS 滤波后的 GWTV 的空间分布与 AIRS GWTV 的空间分布非常吻合。然而，AIRS 过滤的 GWTV 的幅度小于 AIRS GWTV 的幅度。当参数化中包含从中尺度模拟获得的具有较长水平波长分量的附加云顶重力波动量通量谱时，参数化中的AIRS过滤GWTV的幅度和空间分布与AIRS GWTV的幅度和空间分布非常一致。通过参数化，AIRS GWTV 不仅可以通过多个波传播方向而且可以通过 45 度（东北 - 西南）和 135 度（西北 - 东南）两个波传播方向的参数化来很好地再现，这两个方向是为了计算效率而优化选择的。
The realism of ray-based spectral parameterization of convective gravity wave drag, which considers the updated moving speed of the convective source and multiple wave propagation directions, is tested against the Atmospheric Infrared Sounder (AIRS) onboard the Aqua satellite. Offline parameterization calculations are performed using the global reanalysis data for January and July 2005, and gravity wave temperature variances (GWTVs) are calculated at z = 2.5 hPa (unfiltered GWTV). AIRS-filtered GWTV, which is directly compared with AIRS, is calculated by applying the AIRS visibility function to the unfiltered GWTV. A comparison between the parameterization calculations and AIRS observations shows that the spatial distribution of the AIRS-filtered GWTV agrees well with that of the AIRS GWTV. However, the magnitude of the AIRS-filtered GWTV is smaller than that of the AIRS GWTV. When an additional cloud top gravity wave momentum flux spectrum with longer horizontal wavelength components that were obtained from the mesoscale simulations is included in the parameterization, both the magnitude and spatial distribution of the AIRS-filtered GWTVs from the parameterization are in good agreement with those of the AIRS GWTVs. The AIRS GWTV can be reproduced reasonably well by the parameterization not only with multiple wave propagation directions but also with two wave propagation directions of 45 degrees (northeast-southwest) and 135 degrees (northwest-southeast), which are optimally chosen for computational efficiency.