Relationship between the SST diurnal cycle over the Tropical Western Pacific Ocean and subseasonal/seasonal oscillations: Associations with wind speed and outgoing longwave radiation

IF 1.9 4区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Dynamics of Atmospheres and Oceans Pub Date : 2024-07-17 DOI:10.1016/j.dynatmoce.2024.101483
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Abstract

In this study, the relationship between SST diurnal cycle,10 m wind speed (W10) and Outgoing Longwave Radiation (OLR) is investigated. A wavelet spectral analysis was applied to SST hourly data to identify the SST diurnal cycle over the Tropical Western Pacific Ocean (TWPO). The SST diurnal cycle was identified as a prominent spectrum peak in waves with an oscillation period of 1 day. An inverse energy cascade hypothesis suggests that the energy from the SST diurnal cycle propagates and gets absorbed by waves within the subseasonal timescale. Three windows were selected to represent the diurnal (0–2 days), subseasonal (15–60 days), and seasonal (80–200 days) timescales. A wavelet-filtered analysis was performed in these windows, revealing inverse SST/ wind speed and direct SST/ OLR correlations over TWPO. These findings are consistent with empirical parametric models. Additionally, this study demonstrates the rectification mechanism of SST through a wavelet-filtered approach, identifying statistically significant correlations at the 5 % level within the diurnal window (0–2 days), particularly in the central tropical Pacific. Wavelet-filtered anomalies of SST, W10, and OLR along 50–160°E reveal the alternating dry and wet phase propagation across the Indo-Pacific in the subseasonal window, which is associated with the Madden-Julian Oscillation (MJO). Furthermore, westward propagating anomalies in the Indian Ocean and eastward propagating anomalies east of the Maritime Continent (MC) and within the Pacific were identified in the seasonal window, resembling patterns of Rossby and equatorial Kelvin waves, respectively.

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热带西太平洋海温日周期与副季节/季节振荡之间的关系:与风速和外向长波辐射的关系
本研究探讨了 SST 日周期、10 米风速(W)和外向长波辐射(OLR)之间的关系。对 SST 小时数据进行了小波频谱分析,以确定热带西太平洋(TWPO)的 SST 日周期。在振荡周期为 1 天的波浪中,海温昼夜周期被识别为一个突出的频谱峰。反向能量级联假说认为,来自 SST 日周期的能量在次季节时间尺度内传播并被波浪吸收。选择了三个窗口分别代表昼夜(0-2 天)、亚季节(15-60 天)和季节(80-200 天)时间尺度。对这些窗口进行了小波滤波分析,发现在 TWPO 上存在海温/风速反相关和海温/OLR 直接相关。这些发现与经验参数模型一致。此外,本研究还通过小波滤波方法证明了 SST 的整流机制,在昼间窗口(0-2 天)内,特别是在热带太平洋中部,发现了统计意义上显著的 5%级相关性。沿 50-160°E 小波滤波的 SST、W 和 OLR 异常显示,在亚季节窗口中,干湿相交替在整个印度洋-太平洋传播,这与马登-朱利安涛动(MJO)有关。此外,在季节窗口中还发现了印度洋向西传播的异常现象,以及海洋大陆以东和太平洋内部向东传播的异常现象,分别类似于罗斯比波和赤道开尔文波的模式。
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来源期刊
Dynamics of Atmospheres and Oceans
Dynamics of Atmospheres and Oceans 地学-地球化学与地球物理
CiteScore
3.10
自引率
5.90%
发文量
43
审稿时长
>12 weeks
期刊介绍: Dynamics of Atmospheres and Oceans is an international journal for research related to the dynamical and physical processes governing atmospheres, oceans and climate. Authors are invited to submit articles, short contributions or scholarly reviews in the following areas: •Dynamic meteorology •Physical oceanography •Geophysical fluid dynamics •Climate variability and climate change •Atmosphere-ocean-biosphere-cryosphere interactions •Prediction and predictability •Scale interactions Papers of theoretical, computational, experimental and observational investigations are invited, particularly those that explore the fundamental nature - or bring together the interdisciplinary and multidisciplinary aspects - of dynamical and physical processes at all scales. Papers that explore air-sea interactions and the coupling between atmospheres, oceans, and other components of the climate system are particularly welcome.
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