%0 Journal Article %1 LubkenTempFirst %A Lubken, F. J. %A Mullemann, A. %D 2003 %J Journal of Geophysical Research-Atmospheres %K ATMOSPHERE CLOUDS DENSITY DYNAMICS ECHOES GRAVITY-WAVES LEO LOWER MESOPAUSE MIDDLE MODEL PMSE REGION THERMOSPHERE arctic mesosphere rockets temperature transition %N D8 %T First in situ temperature measurements in the summer mesosphere at very high latitudes (78 degrees N) %V 108 %X 1 A total of 24 temperature profiles from similar to92 to 55 km were obtained from falling sphere flights in Longyearbyen (Svalbard, 78degreesN) from 16 July to 14 September 2001. The thermal structure of the upper mesosphere during the summer season ( here from mid-July to 23 August) is characterized by very low temperatures and little variability. The mesopause temperature decreases slightly from similar to130 K in mid-July to 126-128 K in late July/beginning of August. The mesopause altitude in summer is similar to89 km. Compared to 10degrees further south (69degreesN, Andoya), the mesopause temperature is very similar in mid-July but is significantly colder by 6-8 K in the second half of July and in August. Part of this difference ( especially in late August) is due to the later transition from summer to winter in Longyearbyen. The mesopause altitude is higher by approximately 1 km at Longyearbyen compared to Andoya. At 82 km, the temperature in summer is very close to 150 K, very similar to other Arctic and Antarctic stations ("equithermal submesopause''). The temperatures in the upper mesosphere are significantly lower compared to COSPAR International Reference Atmosphere (CIRA, 1986) by up to 20 K. Assuming model water vapor concentrations, we derived the degree of saturation of water vapor ( S). In summer, there is an extended altitude range ( 82 92 km) with supersaturation (S > 1). Occasionally, very high supersaturation was derived ( S > 100). Our temperature measurements are in general agreement with the occurrence morphology of polar mesosphere summer echoes (PMSE). However, double layered structures frequently observed in PMSEs are not a prominent feature of the temperatures in the upper mesosphere.

@article{LubkenTempFirst, abstract = {[1] A total of 24 temperature profiles from similar to92 to 55 km were obtained from falling sphere flights in Longyearbyen (Svalbard, 78degreesN) from 16 July to 14 September 2001. The thermal structure of the upper mesosphere during the summer season ( here from mid-July to 23 August) is characterized by very low temperatures and little variability. The mesopause temperature decreases slightly from similar to130 K in mid-July to 126-128 K in late July/beginning of August. The mesopause altitude in summer is similar to89 km. Compared to 10degrees further south (69degreesN, Andoya), the mesopause temperature is very similar in mid-July but is significantly colder by 6-8 K in the second half of July and in August. Part of this difference ( especially in late August) is due to the later transition from summer to winter in Longyearbyen. The mesopause altitude is higher by approximately 1 km at Longyearbyen compared to Andoya. At 82 km, the temperature in summer is very close to 150 K, very similar to other Arctic and Antarctic stations ("equithermal submesopause''). The temperatures in the upper mesosphere are significantly lower compared to COSPAR International Reference Atmosphere (CIRA, 1986) by up to 20 K. Assuming model water vapor concentrations, we derived the degree of saturation of water vapor ( S). In summer, there is an extended altitude range ( 82 92 km) with supersaturation (S > 1). Occasionally, very high supersaturation was derived ( S > 100). Our temperature measurements are in general agreement with the occurrence morphology of polar mesosphere summer echoes (PMSE). However, double layered structures frequently observed in PMSEs are not a prominent feature of the temperatures in the upper mesosphere.}, added-at = {2009-03-30T22:21:12.000+0200}, author = {Lubken, F. J. and Mullemann, A.}, biburl = {https://www.bibsonomy.org/bibtex/2293f024d1e249a434199919c7d0e27af/bobsica}, description = {Leo's paper references II}, interhash = {c6a24bae5f575d4c6caa0b32b717a664}, intrahash = {293f024d1e249a434199919c7d0e27af}, journal = {Journal of Geophysical Research-Atmospheres}, keywords = {ATMOSPHERE CLOUDS DENSITY DYNAMICS ECHOES GRAVITY-WAVES LEO LOWER MESOPAUSE MIDDLE MODEL PMSE REGION THERMOSPHERE arctic mesosphere rockets temperature transition}, note = {Cited References: AKMAEV RA, 2001, J GEOPHYS RES-ATMOS, V106, P1205 BERGER U, 1999, J GEOPHYS RES-ATMOS, V104, P22083 CHO JYN, 1997, J GEOPHYS RES-ATMOS, V102, P2001 CZECHOWSKY P, 1998, P 8 WORKSH TECHN SCI, P318 FIEDLER F, 2003, IN PRESS J GEOPHYS R, V108 FLEMING EL, 1990, ADV SPACE RES, V10, P11 FORBES JM, 1982, J GEOPHYS RES, V87, P5241 GARCIA RR, 1985, J GEOPHYS RES-ATMOSP, V90, P3850 HEDIN AE, 1991, J GEOPHYS RES, V96, P1159 KORNER U, 2001, J GEOPHYS RES-ATMOS, V106, P9639 LUBKEN FJ, 1994, J ATMOS TERR PHYS, V56, P1969 LUBKEN FJ, 1996, J GEOPHYS RES-ATMOS, V101, P9489 LUBKEN FJ, 1999, GEOPHYS RES LETT, V26, P3581 LUBKEN FJ, 1999, J GEOPHYS RES-ATMOS, V104, P9135 LUBKEN FJ, 2002, J GEOPHYS RES-ATMOS, V107, ARTN 4273 MARTI J, 1993, GEOPHYS RES LETT, V20, P363 RAPP M, 2001, ANN GEOPHYS, V19, P571 RAPP M, 2002, J GEOPHYS RES-ATMOS, V107, ARTN 4392 RAPP M, 2003, J GEOPHYS RES-ATMOS, V108, ARTN 8441 RUSTER R, 2001, GEOPHYS RES LETT, V28, P1471 SCHMIDLIN FJ, 1991, J GEOPHYS RES-ATMOS, V96, P22673 VONZAHN U, 1996, GEOPHYS RES LETT, V23, P141 VONZAHN U, 2003, IN PRESS J GEOPHYS R, V108 WIDDEL HU, 1990, J ATMOS TERR PHYS, V52, P89 ZHU X, 2001, J ATMOS SCI, V58, P2441}, number = {D8}, timestamp = {2009-03-30T22:21:12.000+0200}, title = {First in situ temperature measurements in the summer mesosphere at very high latitudes (78 degrees N)}, volume = 108, year = 2003 }