2018
Influence of large-scale atmospheric variability patterns and sea ice on air temperature on James Ross Island, Antarctica
AMBROŽOVÁ, Klára and Kamil LÁSKABasic information
Original name
Influence of large-scale atmospheric variability patterns and sea ice on air temperature on James Ross Island, Antarctica
Authors
AMBROŽOVÁ, Klára (203 Czech Republic, guarantor, belonging to the institution) and Kamil LÁSKA (203 Czech Republic, belonging to the institution)
Edition
Students in Polar and Alpine Research Conference 2018, 2018
Other information
Language
English
Type of outcome
Conference abstract
Field of Study
10500 1.5. Earth and related environmental sciences
Country of publisher
Czech Republic
Confidentiality degree
is not subject to a state or trade secret
RIV identification code
RIV/00216224:14310/18:00101022
Organization unit
Faculty of Science
ISBN
978-80-210-8957-0
Keywords in English
James Ross Island; Antarctic Peninsula; air temperature; El Nino - Southern Oscillation; Southern Annular Mode
Changed: 25/6/2018 11:11, Mgr. Klára Jeklová, Ph.D.
Abstract
In the original language
In the recent decade, the Antarctic Peninsula Region has been experiencing a period of cooling, which was attributed to increased cyclonic conditions resulting in higher sea ice concentration around the northern AP (Turner et al., 2016). Therehas also been a discussion about the influence of El Nino – Southern Oscillation (ENSO) and Southern Annular Mode (SAM) on air temperature in the Antarctic Peninsula Region which should also depend on the interaction between ENSO and SAM (e.g., Clem et al., 2016). In this study, we have analysed the relationship between air temperature from the Ulu Peninsula (James Ross Island), ENSO, SAM and sea ice in the vicinity of James Ross Island. Air temperature data were measured at 2 m height above ice-free surface of a marine terrace close to Johann Gregor Mendel Czech Antarctic Station during the period 2005–2016. The ENSO phenomenon was represented by Multivariate ENSO Index (MEI; NOAA ESRL PSD, 2018), while sea ice influence was characterised as a sea ice fraction in the gridpoint closest to the Johann Gregor Mendel Station in the MERRA-2 Reanalysis (NASA, 2018). All the data including SAM Index (UCAR, 2018) were analysed as monthly means. There was found a statistically significant negative relationship between air temperature and sea ice (correlation coefficient r = -0.88); however, due to common annual cycle in air temperature and sea ice data, the relationship was only moderate (r = -0.59) when the differences from the monthly mean of the whole study period were utilised. The relationship was strongest in winter and weakest in summer. The influence of SAM on air temperature was only moderate for the whole study period (r = 0.35), even though also statistically significant, and similarly to sea ice, its influence was largest in winter (r = 0.56). Interestingly, there was also a statistically significant relationship between sea ice and SAM in winter (r = -0.52). Finally, no relationship was ascertained between air temperature on the Ulu Peninsula and ENSO.
Links
| CZ.02.1.01/0.0/0.0/16_013/0001708, interní kód MU (CEP code: EF16_013/0001708) |
| ||
| GC16-14122J, research and development project |
| ||
| LM2015078, research and development project |
|