Spatiotemporal Distribution of Atmospheric Ducts in Alaska and Its Relationship with the Arctic Vortex

Abstract

In <?tex id="Q1" staff-cmt="It is very important for each author to have a linked ORCID (Open Researcher and Contributor ID) account on MTS. ORCID aims to solve the name ambiguity problem in scholarly communications by creating a registry of persistent unique identifiers for individual researchers. To register a linked ORCID account, please go to the Account Update page (http://mts.hindawi.com/update/this paper, global position system high-resolution sounding data from 1998 to 2008 were used to statistically analyze the spatiotemporal distribution and determine the probability, thickness, and intensity of atmospheric ducts at 12 stations in Alaska. In addition, the singular value decomposition (SVD) was used to examine the relationship between the Arctic vortex and atmospheric ducts. The annual average probability of atmospheric ducts, primarily surface and elevation ducts, was approximately 30% in Alaska. The probability of elevation ducts was greater than that of surface ducts. The Arctic vortex area and intensity index of each subarea were significantly negatively correlated with the occurrence of atmospheric ducts. Thus, when the area of the Arctic vortex increased and the intensity index of each subarea strengthened, the probability of atmospheric ducts decreased and their characteristics weakened.

Statistical Analysis of Turbulence Characteristics over the Tropical Western Pacific Based on Radiosonde Data

“…Kohma et al [26] mentioned that seasonal variation in radar-based ε shows a broad maximum in August-October and low values in November-January in the lower stratosphere, which is similar to our results. The statistical characteristics of gravity waves at Gadank, which has the same latitude as Guam, are discussed in detail in [53][54][55], which have a certain reference significance for the turbulence distribution characteristics in this paper. Clear seasonal variation in the wave activity was noted in their study, and during the monsoon season, they found that the significant enhancement of gravity wave activity was related to the westward phase of the zonal wind.…”

The Influence of Zonally Asymmetric Stratospheric Ozone Changes on the Arctic Polar Vortex Shift

“…Using numerical model simulations, most previous studies only found significant regional surface responses over the northern middle and high latitudes when comparing cases of extremely high and low Arctic stratospheric ozone (Cheung et al 2014;Karpechko et al 2014;Smith and Polvani 2014;Calvo et al 2015;Xie et al 2016Xie et al , 2017Harari et al 2019). One possible reason is that the dynamical variability of the Arctic stratospheric polar vortex is much larger than its Antarctic counterpart (Hu and Guan 2018;Hu et al 2019a;Mai et al 2020) and as a result Arctic stratospheric ozone depletion is less persistent than Antarctic ozone depletion (Manney et al 2011). Therefore, one would expect a weaker impact of ozone depletion on surface conditions in the Northern Hemisphere compared to the Southern Hemipshere.…”

Response of Ozone to a Gravity Wave Process in the UTLS Region Over the Tibetan Plateau

“…An atmospheric gravity wave is a disturbance phenomenon with vertical propagation properties which plays an important role in global meteorology, climatology, chemistry, and stratosphere dynamics (Holton, 1983;Fetzer and Gille, 1994;Bai et al, 2017). With the development of observational methods (Chang et al, 2020;Mai et al, 2020;Sheng et al, 2020), gravity waves can now be extracted in different ways (He et al, 2020). The most important sources of gravity waves include topography, convection, and wind shear.…”