[{"name":"oden-swerus-2014-misu-weather-2","title":"Weather data from the MISU weather station during the SWERUS-C3 Arctic Ocean expedition in 2014","summary":"Measurements of near-surface wind speed and direction, temperature, relative humidity, air pressure, shortwave and longwave downwelling radiation, and surface temperature (determined from infrared measurement) from the Eastern Arctic Ocean in July to October 2014.\u00a0\r\n\r\nThe dataset provides rare high quality meteorological observations from sea-ice regions of the Arctic Ocean. They enable analysis of meteorological conditions and provide context for other measurements and analysis associated with the expedition.\u00a0\r\n\r\nMeasurements are from the MISU weather station installed on icebreaker Oden\u2019s 7th deck at 25 m above sea level during the SWERUS-C3 expedition to the Arctic Ocean. Additional measurements of temperature and humidity were also made on Oden\u2019s foremast at 20 m above sea level. These data were processed as part of the Arctic Clouds in Summer Experiment (ACSE).","citations":"Tjernstr\u00f6m, M., Achtert, P., Shupe, M. D., Prytherch, J., Sedlar, J., Brooks, B. J., Brooks, I. M., Persson, P. O. G., Sotiropoulou, G., Salisbury, D. J. (2019). Arctic summer air-mass transformation, surface inversions and the surface energy budget. Journal of Climate: 32, 769\u2013789. doi:10.1175\/JCLI-D-18-0216.1\r\n\r\nSotiropoulou, G., Tjernstr\u00f6m, M., Savre, J., Ekman, A. M. L., Hartung, K., and Sedlar, J. (2018). Warm-air advection and air-mass transformation over melting sea ice in the summer Arctic. Quarterly Journal of the Royal Meteorological Society: 144, 2449\u20132462. doi:10.1002\/qj.3316\r\n\r\nPrytherch, J., Brooks, I. M., Crill, P. M., Thornton, B. F., Salisbury, D. J., Tjernstr\u00f6m, M., Anderson, L. G., Geibel, M. C., Humborg, C. (2017): Direct determination of the air-sea CO2 gas transfer velocity in Arctic sea-ice regions. Geophys. Res. Lett., 44. doi:10.1002\/2017GL073593\r\n\r\nSotiropoulou, G., Tjernstr\u00f6m, M., Sedlar, J., Achtert, P., Brooks, B. J., Brooks, I. M., Persson, P. O. G., Prytherch, J., Salisbury, D. J., Shupe, M. D., Johnston, P. E., Wolfe, D. (2016): Atmospheric conditions during the Arctic Clouds in Summer Experiment (ACSE): Contrasting open-water and sea-ice surfaces during melt and freeze-up seasons. J. Clim., 29, 8721\u2013 8744. doi:10.1175\/JCLI-D-16-0211.1\r\n\r\nAchtert, P., Brooks, I. M., Brooks, B. J., Prytherch, J., Persson, P. O. G., Tjernstr\u00f6m, M. (2015): Measurement of wind profiles over the Arctic Ocean from ship-borne Doppler lidar. Atmos. Meas. Tech. 8, 4993-5007. doi:10.5194\/amt-8-4993-2015\r\n\r\nTjernstr\u00f6m, M., Shupe, M. D., Brooks, I. M., Persson, P. O. G., Prytherch, J., Salisbury, D. J., Sedlar, J., Achtert, P., Brooks, B. J., Johnston, P. E, Sotiropoulou, G., Wolfe, D. (2015): Warm-air advection, air mass transformation and fog causes rapid ice melt. Geophys. Res. Lett., 42. doi:10.1002\/2015GL064373","comments":"The main components of the MISU weather station (Gill 2D sonic anemometer, Vaisala PTU TRH and pressure sensor, Eppley PIR and PSP downwelling radiation sensors) were mounted mid-ship on the 7th deck forward railing. Two Heitronics KT15.IIp infrared sensors for measurement of surface temperature (managed by University of Leeds) were mounted separately on the 7th deck, to enable measurement of the sea\/ice surface to beam of the ship. An additional aspirated Rotronic TRH sensor was mounted at the top of Oden\u2019s foremast.\r\n\r\n\r\nWinds are measured relative to the ship. The ship acts to distort the wind speed and direction, increasingly so for winds away from bow-on. A computational fluid dynamics (CFD) model of airflow over Oden is used to correct the measured winds for wind directions within 110\u00b0 of bow on. Due to the significant distortion at the site of the weather station, weather station winds should be treated with caution for wind directions more than 60\u00b0 from bow on. The ship-relative winds and navigation data are also used to derive \u2018true\u2019 wind speed and direction.\r\n\r\n\r\nDownwelling radiation sensors were subject to icing during the expedition. Ice was removed with regular cleaning. Clear-sky radiation determined from radiosonde measurements and RRTM simulations was used to provide further quality control. A flag is provided to indicate when solar radiation may be affected by shading from the ship superstructure.\r\n\r\n\r\nData from the system are combined into a cruise-length file. The data are time-averaged to both 1-minute and 30-minute intervals, to correspond with the micrometeorological averaging periods used for the mast sensors.\r\n\r\n\r\nThese data were processed by Joe Sedlar (CIRES, University of Colorado, Boulder).\r\n\r\n\r\nThe Arctic Clouds in Summer Experiment (ACSE) was a component in the Swedish\u2013Russian\u2013US SWERUS-C3 expedition. The main scientific questions of SWERUS-C3 concerned the linkages between climate, cryosphere, and carbon. ACSE was focused on exploring the role of clouds in shaping the new Arctic climate. Clouds remain a large uncertainty in our understanding of the climate system, in particular in the Arctic. The understanding of the processes involved is poor in part because of a lack of direct observations. The icebreaker Oden was equipped with a suite of in-situ and remote sensing instruments to study these processes in detail, with field work along the Russian Arctic coast on the icebreaker Oden during three months from early summer to early autumn (July 6 to October 14, 2014). \r\n\r\n\r\nMore information about the  SWERUS-C3 expedition is available from the Swedish Polar Research Secretariat. See also SWERUS-C3 program  website, managed by the Department of Geological Sciences, Stockholm University.\n\n\nVersion history\r\nVersion 2\r\nInitial release. Also known as version 2.1.\r\n\r\nVersion 1\r\nNot published.","category":"Atmosphere","subcategory":"Weather observations","keywords":"Weather station; Meteorology; Arctic boundary layer; Arctic clouds; High Arctic; Arctic Ocean; Laptev Sea; Chukchi Sea; East Siberian Sea; Kara Sea; SWERUS-C3; ACSE; Oden","scientist":"John Prytherch, Michael Tjernstr\u00f6m","firstname":"John","lastname":"Prytherch","address":"Department of Meteorology (MISU); Stockholm University","postalcode":"SE-106 91","city":"Stockholm","province":"","country":"Sweden","parameters":"Earth science > Atmosphere","location":"Ocean > Arctic Ocean","progress":"Completed","language":"English","project":"Arctic Clouds in Summer Experiment (ACSE). This was a component in the SWERUS-C3 international research expedition 2014 using icebreaker Oden in the Arctic Ocean, with base funding from the Swedish Knut and Alice Wallenberg Foundation.","publisher":"Bolin Centre Database","version":"2","constrains":"None","access":"Free"}]