Decadal variability of winter temperatures in the Antarctic Peninsula region

Kravchenko, Volodymyr; Evtushevsky, Oleksandr; Grytsai, Asen; Milinevsky, Gennadi

doi:10.1017/s0954102011000423

Cited by 17 publications

(23 citation statements)

References 28 publications

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“…The corresponding maximums of annual mean scalegram of the sea level are of about 4 and 10 years that agree with estimate 9 year obtained by Galassi and Spada (2017) using decomposition by empirical orthogonal functions. Maximums in air temperature scalegrams occur over periods of 4, 6, and 10-16 years, which is consistent with the results (Kravchenko et al, 2011), whereas the sea level pressure maximum corresponded to a period of 3-4 years.…”

Section: Resultssupporting

confidence: 91%

“…Unlike sea level and temperature scalegrams, sea level pressure scalegrams have a maximum of 3-4 and 6 years, whereas the largest amplitudes of wavelet coefficients are observed in winter and spring. The presence of maximums in the scalegrams of marine and atmospheric parameters on AP for the period of 6-8 years and 3-4 years confirms the relationship between processes in the atmosphere and ocean in West Antarctica with the natural fluctuations of the ocean-atmosphere system, such Southern Annular Mode (SAM) and El Niño Southern Oscillation (ENSO), which have typical periods of 6-8 and 3-4 years (Turner, 2004;Stastna, 2010;Kravchenko et al, 2011;Clem and Fogt, 2013). Scalegrams of sea level, air temperature, and sea level pressure mean annual values, as well as mean annual values of the Southern Oscillation Index (SOI) and Southern Annular Mode Index (SAM) are shown in Fig.…”

Section: Resultssupporting

confidence: 55%

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Long-term variations of the sea level on the western coast of the Antarctic Peninsula

Maderich

Terletska

Brovchenko

et al. 2019

UAJ

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The aim of the study is to analyze seasonal and interannual changes in sea level on the western coast of the Antarctic Peninsula. Objects of study are seasonal and interannual variability of sea level, air temperature, pressure at sea level, precipitation in the period 1960-2018 at the Faraday/Akademik Vernadsky station, which was considered as representative site for the Antarctic Peninsula. Statistical methods of study were used, including estimates of linear trends of time series using the nonparametric Sen's estimator of slope. The Mann-Kendall test was used to assess the significance of the slope of the trend. Time variability analysis was performed using wavelet analysis. Using the MATrix LABoratory (MATLAB) software package, squared of wavelet coefficients were calculated depending on the scale and shift or scalograms that characterize the local energy spectrum, and scalegrams calculated by averaging the scalograms by time shifts. The Morlet wavelet transformations were used. The results of the calculations showed that the trend of sea level at the Faraday/ Akademik Vernadsky station in the period 1960-2018, according to observations and correction on glacial isostatic adjustment of the crust is in the range from 3.05 to 3.45 mm/year, which is significantly higher than the global trend of 2.1 mm/year. Sea level scalograms allow estimating time-averaged periods and amplitudes of the coefficients for each season. In the austral winter and spring characteristic periods were 4-6 years, whereas the summer and autumn periods are characterized by 6-8 years, as well as by the highest amplitudes of the coefficients. All seasons are characterized by the appearance of a weakly pronounced period of about 4 years. The presence of peaks in the scalegrams at 6-8 and 3-4 years confirms the relationship of atmospheric and oceanic processes in West Antarctica to the natural variations of the ocean-atmosphere system, such as the Southern Annular Mode and El Niño-Southern Oscillation, which varies with typical 3-4 and 6-8 year periods. It was concluded that, unlike air temperature, the sea level trend is relatively weakly depends on the season, with the exception of autumn, when sea level trend is three times smaller than the average value. At the same time, the air temperature trend is the largest in the austral winter and the lowest in the summer.

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Section: Resultssupporting

confidence: 91%

Section: Resultssupporting

confidence: 55%

Long-term variations of the sea level on the western coast of the Antarctic Peninsula

Maderich

Terletska

Brovchenko

et al. 2019

UAJ

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“…In the time domain, the Morlet wavelet is composed of real and imaginary parts. The real part is a cosine function, which captures the amplitudes of the positive and negative oscillatory part of the analyzed time series and the imaginary part provides the phase modulation of the analyzed signal [34,35,46].…”

Section: Continuous Wavelet Transformmentioning

confidence: 99%

Characterization of Temporal and Spatial Variability of Phosphorus Loading to Lake Erie from the Western Basin Using Wavelet Transform Methods

2018

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The characterization of temporal and spatial patterns in phosphorus (P) loading in Lake Erie is essential in order to continue monitoring the excessive P condition that comes from the western Lake Erie Basin. This study aims to perform such a characterization using the continuous wavelet transform (CWT) and the discrete wavelet transform (DWT) methods. These wavelet transformations were conducted on streamflow data, TP loads, and soluble reactive phosphorus (SRP) of six stations located near Lake Erie of Northern Ohio. These stations are located near the outlet of Cuyahoga, Grand, Maumee, Vermilion, Raisin, and Sandusky watersheds. Long-term continuous P loading data, in which some dated back to 1970, were used in the analysis. The results obtained from the CWT and DWT approaches were found to complement each other. Streamflow had significant mixed variability at 1, 2, and 4 years. The variability for SRP was limited to 1 and 2 years while the TP variability was only seen at the 1-year scale. It was interesting to find that strong temporal patterns of SRP were observed in most of the watersheds only after the mid-1990s. The CWT wavelet spectra also reflected the land use characteristics of each watershed. For example, the wavelet spectra of surface runoff and TP for the agricultural watersheds (i.e., Raisin, Sandusky, and Maumee Rivers) were similar and characterized by significant variability primarily at the annual scale and at the two to four-year periodicities. The urbanized watershed (i.e., Cuyahoga River) did not show any association between either phosphorus (TP or SRP) with surface runoff and baseflow, which indicates that P in the urbanized watershed was not driven by the flow.

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“…Jacka and Budd (1998) analyzed surface temperature data from 16 stations on the Antarctic continent and 22 stations on Southern Ocean islands and found warming rates of 0.9-1.2 and 0.7-1 • C, respectively. In particular, in the West Antarctic and the Antarctic Peninsula, the warming is several times higher than in other regions (Jacka and Budd, 1998;Vaughan et al, 2003;Kravchenko et al, 2011;IPCC, 2013). The Antarctic sea ice as well as the inland ice sheet are potentially subject to change in such a changing environment.…”

Section: Introductionmentioning

confidence: 96%

Answer to the reviewers' report

Wex¹

2018

Preprint

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Decadal variability of winter temperatures in the Antarctic Peninsula region

Cited by 17 publications

References 28 publications

Long-term variations of the sea level on the western coast of the Antarctic Peninsula

Long-term variations of the sea level on the western coast of the Antarctic Peninsula

Characterization of Temporal and Spatial Variability of Phosphorus Loading to Lake Erie from the Western Basin Using Wavelet Transform Methods

Answer to the reviewers' report

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