In this study, we defined an index of the Antarctic Circumploar Wave （ACW） and analyzed its variability for the period 1951 2010. A regime shift of the circumpolar westerly in the Southern Ocean and an inter- deeada...In this study, we defined an index of the Antarctic Circumploar Wave （ACW） and analyzed its variability for the period 1951 2010. A regime shift of the circumpolar westerly in the Southern Ocean and an inter- deeadal change of the ACW, which occurred around the mid-1970s, were identified. Associated with these changes, the variations of the ACW show three distinct sub-periods： 1951 1973, 1974 1980, and 1981-2010. They are characterized by different speeds, amplitudes, and wave structures. We briefly investigated possible mechanisms responsible for the different behaviors of the ACW during the three periods.展开更多
Resorting to recent results on subperiodic trigonometric quadrature,we provide three product Gaussian quadrature formulas exact on algebraic polynomials of degree n on circular lunes.The first works on any lune,and ha...Resorting to recent results on subperiodic trigonometric quadrature,we provide three product Gaussian quadrature formulas exact on algebraic polynomials of degree n on circular lunes.The first works on any lune,and has n^(2)+O(n)cardinality.The other two have restrictions on the lune angular intervals,but their cardinality is n^(2)/2+O(n).展开更多
基金supported by Project of the Antarctic Environment Investigation and Assessment of China,SOA (Grant No. JDZX2011-2015)
文摘In this study, we defined an index of the Antarctic Circumploar Wave （ACW） and analyzed its variability for the period 1951 2010. A regime shift of the circumpolar westerly in the Southern Ocean and an inter- deeadal change of the ACW, which occurred around the mid-1970s, were identified. Associated with these changes, the variations of the ACW show three distinct sub-periods： 1951 1973, 1974 1980, and 1981-2010. They are characterized by different speeds, amplitudes, and wave structures. We briefly investigated possible mechanisms responsible for the different behaviors of the ACW during the three periods.
基金The research is supported by the“ex-60%”fundsby the biennial project CPDA124755 of the University of Padova,and by the GNCS-INdAM.
文摘Resorting to recent results on subperiodic trigonometric quadrature,we provide three product Gaussian quadrature formulas exact on algebraic polynomials of degree n on circular lunes.The first works on any lune,and has n^(2)+O(n)cardinality.The other two have restrictions on the lune angular intervals,but their cardinality is n^(2)/2+O(n).
