Signature of atmospheric oscillations in GPS-measured tropospheric delay |
| |
Authors: | C Suresh Raju Korak Saha K Parameswaran |
| |
Institution: | 1. Institute of Space Science, National Central University, No. 300, Jhongda Rd., Jhongli 32001, Taiwan;2. Center for Space and Remote Sensing Research, National Central University, No. 300, Jhongda Rd., Jhongli 32001, Taiwan;3. National Space Organization, 8F, 9 Prosperity 1st Road, Hsin-Chu 30078, Taiwan;1. Geology Department, Faculty of Science, South Valley University, Qena 83523, Egypt;2. Center for Remote Sensing, Boston University, 725 Commonwealth Ave., Boston, MA 02215-1401, USA |
| |
Abstract: | Ground-based GPS finds potential applications in many atmospheric studies such as spatial distribution of columnar water vapor as well as the tidal oscillations in the atmosphere. The zenith tropospheric delay (ZTD) derived from GPS data at two Indian IGS stations are used to establish its potential for studying the atmospheric tidal, intra-seasonal and planetary oscillations. The major tidal oscillations observed in ZTD data are diurnal, semi-diurnal and their harmonics. Prominent intra-seasonal oscillations observed in ZTD are reported for the first time in this context. These intra-seasonal oscillations are Madden–Julian Oscillation (30–70 days, 60–90 days, 100–120 days) and planetary waves (like 27, 16 and 5–10 days periodicities). Quantification of these periodicities will provide a useful handle to improve the empirical models employed in the estimation of tropospheric delay. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |
|