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Longitude

About: Longitude is a research topic. Over the lifetime, 2260 publications have been published within this topic receiving 54988 citations. The topic is also known as: angle of longitude.


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Journal ArticleDOI
01 Jan 1987-Tellus A
TL;DR: In this paper, a time-longitude lag-correlation analysis is applied to the 500 mb geopotential height along 50°N and 50°S for individual basepoints and averaged over the latitude circle.
Abstract: The common time-longitude section (or Hovmoller diagram) shows longitude and intensity of troughs and ridges as a function of time. It is modified to a time-longitude lag-correlation diagram to yield statistically relevant estimates of zonal wavelengths, phase and group velocities. Different scales can be distinguished after the data sets have been treated by band- and low-pass filters. The lag-correlation analysis is applied to the 500 mb geopotential height along 50°N and 50°S for individual basepoints and averaged over the latitude circle. This technique is also useful if the local or zonally averaged dynamics of numerical models is to be statistically verified.

13 citations

Journal ArticleDOI
TL;DR: In this article, the authors presented the response of the temperature-of-CPM to solar activity using fourteen-year SABER data series over 80°S-80°N regions.
Abstract: The thermal structure and energy balance of upper atmosphere are dominated by solar activity. The response of Cold-Point-Mesopause (CPM) to solar activity is an important form. This article presents the response of the Temperature-of-CPM (T-CPM) to solar activity using fourteen-year SABER data series over 80°S–80°N regions. These regions are divided into 16 latitude zones with 10° interval, and the spatial areas of 80°S—80°N,180°W—180°E are divided into 96 lattices with 10°(latitude) × 60°(longitude) grid. The annual-mean values of T-CPM and F10.7 are calculated. The least squares regression method and correlation analysis are applied to these annual-mean series. First, the results show that the global T-CPM is significantly correlated to solar activity at the 0.05 level of significance with correlation coefficient of 0.90. The global solar response of T-CPM is 4.89 ± 0.67 K/100 Solar-Flux-Units (SFU). Then, for each latitude zone, the solar response of T-CPM and its fluctuation are obtained. The solar response of T-CPM becomes stronger with increasing latitude. The fluctuation ranges of solar response at middle latitude regions are smaller than those of equator and high latitude regions, and the global distribution takes on W-shape. The co-relationship analysis shows that the T-CPM is significantly correlated to solar activity at the 0.05 level of significance for each latitude zone. The correlation coefficients at middle latitude regions are higher than those of equator and high latitude regions, and the global distribution takes on M-shape. At last, for each grid cell, the response of T-CPM to solar activity and their correlation coefficient are presented.

13 citations

Journal ArticleDOI
TL;DR: A transect of vertical profiles of currents, temperature, salinity, density, and microstructure from 10 to 400 m was carried out every 15′ of latitude from 2°N to 2°S along longitude 176°W in October, 1990, during the 51st Cruise of the R / V Akademik Kurchatov.

13 citations

Journal ArticleDOI
TL;DR: In this article, the amplitude, period and phase of the third quasi-biennial cyclone were determined at nine stations between 7°S and 66°S centred on the longitude of eastern Australia.
Abstract: Zonal winds in the stratosphere for a period of 20 years have been analysed at nine stations between 7°S and 66°S centred on the longitude of eastern Australia. The amplitude, period and phase of the third (‘quasi-biennial’) cycle are determined. Although a coherent pattern emerges in the variation of period with latitude and height it is concluded that, at least in the tropics, the representative period is 832 days (27.35 months). The well-known maximum in amplitude of this third cycle in the tropics decreases to a minimum at about 30°S but increases again polewards, reaching a maximum at about 50°S at the highest levels of observation (6mb). The phase of the cycle ‘leads’ at high levels and low latitudes and also at the height and latitude of the polar night jet. Below these maxima there is a downward propagation of the cycle but little phase variation with height exists in middle latitudes. For the tropics, the variation with latitude of amplitude and phase is consistent with lateral diffusion of a forced equatorial cycle, with eddy diffusion coefficients of 1 × 109cm2s−1 at 80mb, decreasing to 3 × 108cm2s−1 at 25mb.

13 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023240
2022432
202142
202042
201960
201851