Spatial variability in long-term temperature trends in the middle atmosphere from SABER/TIMED observations

Temperatures obtained from Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) instrument on board Thermosphere Ionosphere Mesosphere Energetics Dynamics (TIMED) satellite during period 2003 to 2019 are analysed obtain trends in region 50°S 50°N method Empirical Mode Decomposition (EMD). This is used remove long-term oscillations data accurately estimate linear trends. The novelty current study dividing entire into sub-regions 5° latitude and 10° longitude investigate associated longitudinal variability. shows that global middle atmosphere, including mesopause stratopause, cooling as a whole. In stratosphere lower mesosphere observed ?0.5 K/decade upper mesosphere, increase ?1.0 K/decade. Mesopause temperatures Southern Hemisphere stratopause Northern showing stronger comparison other hemisphere. Over tropical subtropical regions, trend over Indian Ocean Asian while symmetric around equator Pacific Atlantic Oceans. Two important results present follows: (1) A warming trend, reaching 2.5 K/decade, 77 km Equator adjoining latitudes, which attributed processes leading mesospheric semi-annual oscillation (MSAO). (2) Anomalous (SIO) longitudes. Temperature large negative ranging ?1 ?2 SIO (SPO) (SAO) lying same latitudinal band small positive, values 1 It envisaged recent accelerated probably responsible for above.