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Wyświetlanie 1-10 z 71
Tytuł:
Seasonal Variations of Sea Surface Temperature and Sea Current in the Celebes Sea
Autorzy:
Hapsari, Siti Nirmala
Syamsuddin, Mega Laksmini
Riyantini, Indah
Sunarto, Sunarto
Tematy:
Celebes Sea
Sea Current
Sea Surface Temperature
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Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Powiązania:
https://bibliotekanauki.pl/articles/1031483.pdf  Link otwiera się w nowym oknie
Opis:
The waters of the Celebes Sea are an area that has quite complex dynamics because it is influenced by several factors, either regionally or globally. This influence certainly has an impact on variations in oceanographic conditions in waters such as Sea Surface Temperature (SST) and sea currents. Currently, there are many observations of oceanographic data, one of which is by using remote sensing methods. The purpose of this study was to determine the seasonal variations in sea surface temperature and sea surface currents in the Celebes Sea using a remote sensing system in a time series for 5 years (2014-2018). The results of this study indicate data on seasonal variation of SST and sea surface currents have an average maximum SST value for 5 years occurring in the eastern season and the second transitional season (May, June, July) with an average value range of 30.6 °C - 31.1 °C and the average maximum sea current velocity for 5 years occurs in the western monsoon with a value range of 0.72 m/s - 0.77 m/s. The high SST value and sea current velocity are caused by the influence of the season which causes variations in the ongoing rainfall, also presumably due to the opposite direction between the monsoon wind and the direction of the main current flowing in the Celebes Sea.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Indian Ocean wind speed variability and global teleconnection patterns
Autorzy:
Sinha, M.
Jha, S.
Chakraborty, P.
Tematy:
wind speed
variability
sea surface temperature
remote sensing
Indian Ocean
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Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Powiązania:
https://bibliotekanauki.pl/articles/2079299.pdf  Link otwiera się w nowym oknie
Opis:
The influence of the local sea surface temperature (SST) and remote ENSO (El Niño-Southern Oscillation) indices on the wind speed (WS) data were explored for the Indian Ocean region. Relationships among the parameters were studied using spatial correlation plots and significant correlation ranges. Two months (July and January) representing opposite monsoon phases were selected for analysis for the period 1950–2016. There was a significant negative correlation between WS and SST over the Bay of Bengal (BOB) during July. Although different ENSO indices correlated differently in different areas of the Indian Ocean, the region off the coast of Sri Lanka was most significantly teleconnected. The southwest monsoon locally impacted the WS and SST relationship and the WS parameter was remotely teleconnected in both the monsoon seasons. Further empirical orthogonal function (EOF) analysis was applied on the 67 years WS data of the BOB region to extract the dominant mode representing maximum variability of the total variance. The temporal pattern of the first principal component (PC1) of WS data was linked to the North Atlantic Oscillations in January and the Atlantic Multidecadal Oscillation in July respectively. The continuous wavelet power spectra of the PC1 of WS showed significant regions in the 2–4-year band resembling the ENSO variability. Wavelet coherence applied between PC1 of WS and the ENSO indices showed greatest values for January in the 8–16-year band and for July in the 0–4-year band. A close relationship was established between the WS variability in BOB and the ENSO indices.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ zmian temperatury wody powierzchniowej mórz Barentsa, Norweskiego i Grenlandzkiego na trend rocznej temperatury powietrza na Spitsbergenie
Influence of changes in sea surface temperature in the Barents, Norwegian and Greenland seas on the annual air temperature trend at Spitsbergen
Autorzy:
Styszyńska, A.
Tematy:
temperatura powietrza
temperatura powierzchni morza
Spitsbergen
air temperature
sea surface temperature
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Wydawca:
Stowarzyszenie Klimatologów Polskich
Powiązania:
https://bibliotekanauki.pl/articles/261025.pdf  Link otwiera się w nowym oknie
Opis:
Praca omawia wpływ zmian temperatury wód powierzchniowych (SST - sea surface temperature) mórz Barentsa, Norweskiego i Grenlandzkiego zachodzących w okresie zimowego wychładzania (styczeń-kwiecień) na roczne i sezonowe wartości temperatury powietrza na Spitsbergenie w okresie 1912-2010. Stwierdzono, że zimowa SST rozległej powierzchni mórz otaczających Spitsbergen jest silnie skorelowana z roczną temperaturą powietrza na Spitsbergenie przez kolejne trzy lata (k, k+1, k+2). Powierzchnia akwenów, na których występują opóźnione korelacje z temperaturą powietrza na Spitsbergenie stopniowo zmniejsza się, a siła związków słabnie. Obszary, na których w roku k+2 korelacje utrzymują najwyższą (p < 0.001) istotność odtwarzają szlaki przenosu prądowego. Akwen, na którym zmienność SST z roku k najsilniej koreluje z roczną i zimową temperaturą powietrza na Spitsbergenie w kolejnych trzech latach (k, k+1, k+2) nie zmienia swojego położenia - jest to obszar leżący na pograniczu N części Morza Norweskiego i W części Morza Barentsa - między Bjornoyą a Nordkapem. Długookresowe zmiany temperatury powierzchni mórz wokółspitsbergeńskich regulują długookresową zmienność temperatury powietrza na Spitsbergenie, a występujący w przebiegu rocznej temperatury powietrza trend ma swoją genezę w zmianach zasobów ciepła w wodach tych mórz.
This work discusses the influence of changes in SST (sea surface temperature) of the Barents, Norwegian and Greenland seas occurring during winter cooling (January-April) on annual and seasonal air temperatures at Spitsbergen during 1912-2010. It was found that the winter SST of vast seas surrounding the region of Spitsbergen is strongly correlated with annual and winter air temperature at Spitsbergen during the next three years (k, k+1, k+2). The sea areas, where the delayed correlations with air temperature at Spitsbergen are observed, gradually decrease, and the strength of the correlation decreases. The routes of moving current represent the areas where correlations maintain the highest significance (p <0.001) in the year k+2. The sea area, where variability of SST from year k is most strongly correlated with the annual and winter air temperature at Spitsbergen in the next three years (k, k+1, k+2) does not change its position - this is the area lying on the border of the north part of the Norwegian Sea and the west part of the Barents Sea - between Bjornoya and Nordkap. Long-term sea surface temperature changes of vast seas surrounding the region of Spitsbergen regulate the long-term variability of the air temperature on Spitsbergen, and appearing in the course of the annual air temperature trend has his own genesis in changes of resources of the warmth in waters of these seas.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ zmian temperatury powierzchni oceanu na Morzu Norweskim na temperaturę powietrza na Svalbardzie i Jan Mayen (1982-2002)
The influence of the changes in sea surface temperature of the Norwegian Sea on the air temperature at Svalbard and Jan Mayen (1982-2002)
Autorzy:
Kruszewski, G.
Marsz, A. A.
Zblewski, S.
Tematy:
temperatury powietrza
temperatury powierzchni oceanu
Morze Norweskie
air temperature
sea surface temperature
Norwegian Sea
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Wydawca:
Stowarzyszenie Klimatologów Polskich
Powiązania:
https://bibliotekanauki.pl/articles/260931.pdf  Link otwiera się w nowym oknie
Opis:
This work deals with correlations between SST in the Norwegian Sea and air temperature at selected stations located in the Atlantic sector of Arctic (Bjornoya, Hornsund, Svalbard-Lufthavn, Ny Alesund and Jan Mayen). The southern and central parts of the Norwegian Sea show the strongest correlation with the air temperature at the above mentioned stations, whereas the northern parts of this sea show weaker correlation. Apart from synchronic correlations (occurring in the same months) asynchronic correlations have been found. The latter are generally much stronger than the synchronic ones. The predominant influence on the changes in air temperature at the stations have the winter SST (JFMA) in the central part of the Norwegian Sea (grid 2° x 2°, 67°N, 010°E). These winter SST show quite strong correlations with monthly air temperature at Bjornoya, Hornsund, Svalbard-Lufthavn and Jan Mayen in July, August and September. At Ny Alesund station the period with statistically significant correlation between the air temperature and the winter SST is limited to September. The strongest correlation can be observed in August (see Table 4). The observed correlations result from modification in atmospheric circulation, caused by increased heat volume in the Norwegian Sea. Such modification is reflected in the increased frequency of occurrence of meridional atmospheric circulation, which is accompanied by the increase in the frequency of air advection from the S to this sector of Arctica. Some correlations which show more significant time shift have also been observed (see Table 5). Winter SST indicate positive correlations with air temperature observed at Bjornoya and Horn-sund in August and September the following year and at Svalbard-Lufthavn in September. At Ny Alesund station the coefficients of correlation with the air temperature in the following year are increased but they do not reach the statistically significant level. Another period with statistically significant correlations is November and December the following year; significant correlations with winter SST occur at Bjornoya (r = 0.71) and all stations located on Spitsbergen (r = 0.57). The correlations of SST with air temperature observed at Jan Mayen the following year are different, i.e. the presence of strong correlations is limited to summer season - July, August and September (r ~ 0.6). The correlations with winter SST occurring in November and December the following year is connected with warm masses carried to this region together with waters with the West Spitsbergen Current. Correlations between SST and air temperature present in summer and at the end of summer the following year may probably be influenced by the modification of atmospheric circulation. The only significant correlation with summer (July and August) SST indicates the temperature of February the following year at stations located on Spitsbergen and Jan Mayen. These correlations are negative (r ~ -0.55 - -0.50). The reason for occurrence of such correlations is not clear. The changeability of winter SST in the central part of the Norwegian Sea explains from 20% (Hornsund) to 32% (Bjornoya) of changeability in annual air temperature at the above mentioned stations in the same year and from 34% (Jan Mayen) to 41% (Hornsund) of changeability in annual air temperature in the following year. The increased level of explanation of changeability in air temperature the following year influenced by winter SST is connected with the delayed flowing of the Atlantic waters to high latitudes carried with the Norwegian Current and the West Spitsbergen Current.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of direct and inverse methods of satellite observations downscaling for the coastal zone area
Autorzy:
Chybicki, A.
Łubniewski, Z.
Tematy:
Earth observation
land surface temperature
sea surface temperature
PBIM downscaling method
surface effective emissivity
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Wydawca:
Polskie Towarzystwo Akustyczne
Powiązania:
https://bibliotekanauki.pl/articles/331736.pdf  Link otwiera się w nowym oknie
Opis:
The Earth observation satellite imaging systems have known limitations, especially regarding their spatial and temporal resolution. Therefore, approaches which aim to combine data retrieved from sensors of higher temporal and lower spatial resolution with the data characterized by lower temporal but higher spatial resolution are of high interest. This allows for joint utilization of the advantages of both these types of sensors. As there are several ways to achieve this goal, in this paper two approaches, direct and inverse, of downscaling the land surface temperature (LST) derived from low resolution imagery acquired by the Advanced Very High Resolution Radiometer (AVHRR) were evaluated. The applied downscaling methods utilize biophysical properties of the surface sensed using short wave infrared and thermal band. The presented algorithm evaluation was performed on the basis of a specific test case: the coastal zone area of the Gulf of Gdańsk, Poland. In this context, the objective presented in the study was to compare two methods of downscaling for a specific test case in order to evaluate how the proposed approaches cope with the specific conditions of the coastal zone area.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zmiany temperatury powierzchni Morza Czukockiego (1982-2008)
Changes of sea surface temperature at the Chukchi Sea (1982-2008)
Autorzy:
Zblewski, S.
Marsz, A. A.
Tematy:
Morze Czukockie
temperatura powierzchni morza
cyrkulacja atmosferyczna
sea surface temperature
atmospheric circulation
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Wydawca:
Stowarzyszenie Klimatologów Polskich
Powiązania:
https://bibliotekanauki.pl/articles/261049.pdf  Link otwiera się w nowym oknie
Opis:
Praca charakteryzuje zmiany temperatury powierzchni Morza Czukockiego zachodzące w okresie 1982-2008 oraz wpływ na te zmiany cyrkulacji atmosferycznej. Stwierdzono występowanie dodatnich, istotnych statystycznie, miesięcznych i rocznych trendów temperatury powierzchni morza (TPM), nierównomiernie rozłożonych w przestrzeni. Obserwuje się występowanie asynchronicznych związków między cyrkulacją atmo-sferyczną a TPM, przy czym zmiany cyrkulacji atmosferycznej wyprzedzają w czasie zmiany TPM. W badanym okresie najsilniejszy wpływ na miesięczne i roczne zmiany TPM ma charakter cyrkulacji atmosferycznej występu-jącej w dłuższych okresach – wiosną, a nawet w całym okresie marzec-sierpień i marzec-wrzesień, poprzedzającym moment wystąpienia maksimum temperatury powierzchni morza. Wpływ cyrkulacji atmosferycznej na zmiany TPM nie jest bezpośredni, lecz realizuje się poprzez wpływ na dryf lodów na Morzu Czukockim w okresie wiosen-nym i letnim.
This work characterizes changes in sea surface temperature of the Chukchi Sea observed in the period 1982- 2008 and the way atmospheric circulation (mid-troposphere circulation, modified Arctic Dipole) influences these changes. The research made use of homogeneous data series of sea surface temperature (SST) originating from the data set NOAA NCDC ERSST v.2, in a 2�‹. x 2�‹�É grid (Fig. 1). In the examined period (1982-2008) the increase in sea surface temperature of the Chukchi Sea was observed (Table 1). In the central and southern part of the sea the increase in SST is much stronger (+0.067 deg/year) than in the northern part (0.002 deg/year). This phenomenon is connected with the fact that the northern part of the examined sea area was freed from ice only after the year 2002. During the observed period there was also mean annual increase in SST ranging from 0.62�‹C in the south-west part to 0.03�‹C in the northern part of the examined region (Fig. 2). In the period 1982-2008 strong, statistically significant correlations between SST and the character of the atmospheric circulation observed before were noted. The correlations of SST in the Chukchi Sea are stronger than those with the modified Artic Dipole. The changeability of value of the modified Arctic Dipole from March to September explains 36% (in the eastern part of the sea area) and up to 46% (in the western part) of annual changeability in SST. However the influence of changes in atmospheric circulation on the changeability of SST is not direct. The character of atmospheric circulation noted in spring season (III-V) and even during the entire spring and summer seasons (III-VIII) has influence on the ice drifting in the Chukchi Sea. The drifting ice has influence on the time during which the sea surface accumulates the heat and as a consequence affects the sea surface temperature. This sequence of consecutive correlations seems to be most important for the changes in the SST. The secondary role affecting the changes in SST in the Chukchi Sea plays the increased transport of warm water from the Bering Sea forced by strong positive phases of modified Arctic Dipole in September. This influence is limited to the area up to the southern part of the Chukchi Sea and to the time till the last three months (October-December).
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 71

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