5,133 research outputs found
Sea ice microwave emissivity observed from the Polar 5 aircraft during the airborne field campaigns ACLOUD and AFLUX
No full textThis data contains sea ice emissivity observations from the Microwave Radar/radiometer for Arctic Clouds (MiRAC; Mech et al., 2019) onboard the Polar 5 aircraft during the ACLOUD (RF23 and RF25) and AFLUX (RF08, RF14, and RF15) field campaigns. MiRAC consists of two components: MiRAC-A with an 89 GHz channel (25° incidence angle, horizontal polarization) and MiRAC-P with six channels around the 183.31 GHz water vapor absorption line (183.31±0.6, ±1.5, ±2.5, ±3.5, ±5.0, and ±7.5 GHz) and two window channels at 243 and 340 GHz (nadir). Note that the polarization and viewing angles of MiRAC-A and -P differ. The emissivity was calculated from the observed brightness temperature with ancillary information on the surface temperature from a KT-19 infrared radiometer and atmospheric profile. The radiative transfer simulations required for the emissivity calculation are performed with the Passive and Active Microwave radiative TRAnsfer (PAMTRA) model (Mech et al., 2020). Further details on the emissivity calculation are described in Risse et al. (2024)
Radar reflectivities at 94 GHz and microwave brightness temperature measurements at 89 GHz during the MOSAiC-ACA Arctic airborne campaign
No full textThe published data set consists of measurements performed by the active cloud radar as part of the Microwave Radar and radiometer for Arctic Clouds (MiRAC; Mech et al., 2019) operated on board the Polar 5 research aircraft during 7 flights of the Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) Airborne observations in the Central Arctic (MOSAiC-ACA; Mech et al., 2022) campaign, carried out in late summer 2020 northwest of Svalbard (Norway). The measurement campaign is embedded in the Transregional Collaborative Research Centre TR 172 (ArctiC Amplification: Climate Relevant Atmospheric and SurfaCe Processes, and Feedback Mechanisms (AC)3. The published data set consists of radar reflectivities of the FMCW 94 GHz cloud radar transformed to nadir view as well as brightness temperature measurements at 89 GHz with a 25 deg backward inclination with respect to the aircraft's fuselage. It should be considered that the brightness temperatures have not been corrected for aircraft attitude. The data set has been quality-checked and is available in NetCDF format for each flight separately.
Details on the instrument can be found in Mech et al. (2019) and on the dataset and its usage in Mech et al. (2022)
Radar reflectivities at 94 GHz and microwave brightness temperature measurements at 89 GHz during the AFLUX Arctic airborne campaign in spring 2019 out of Svalbard
No full textThe published data set consists of measurements performed by the active cloud radar as part of the Microwave Radar and radiometer for Arctic Clouds (MiRAC; Mech et al., 2019) operated on board the Polar 5 research aircraft during 14 flights of the Airborne measurements of radiative and turbulent FLUXes of energy and momentum in the Arctic boundary layer (AFLUX) campaign, carried out in spring 2019 northwest of Svalbard (Norway). The measurement campaign is embedded in the Transregional Collaborative Research Centre TR 172 (ArctiC Amplification: Climate Relevant Atmospheric and SurfaCe Processes, and Feedback Mechanisms (AC)3. The published data set consists of radar reflectivities of the FMCW 94 GHz cloud radar transformed to nadir view as well as brightness temperature measurements at 89 GHz with a 25 deg backward inclination with respect to the aircraft's fuselage. It should be considered that the brightness temperatures have not been corrected for aircraft attitude. The data set has been quality-checked and is available in NetCDF format for each flight separately.
Details on the instrument can be found in Mech et al. (2019) and on the dataset and its usage in Mech et al. (2022
Radar reflectivities at 94 GHz and microwave brightness temperature measurements at 89 GHz during the ACLOUD Arctic airborne campaign in early summer 2017 out of Svalbard
No full textThe published data set consists of measurements performed by the active cloud radar as part of the MiRAC (Microwave Radar and radiometer for Arctic Clouds) operated on board the Polar 5 research aircraft during 19 flights of the Arctic CLoud Observations Using airborne measurements during polar Day (ACLOUD) campaign, carried out in early summer 2017 northwest of Svalbard (Norway). The measurement campaign is embedded in the Transregional Collaborative Research Centre TR 172 (ArctiC Amplification: Climate Relevant Atmospheric and SurfaCe Processes, and Feedback Mechanisms (AC)3. The published data set consists of radar reflectivities of the FMCW 94 GHz cloud radar transformed to nadir view as well as brightness temperature measurements at 89 GHz with a 25 deg backwards inclination with respect to the aircraft fuselage The data set has been quality checked and is available in netcdf format for each flight separately.
Details on the instrument can be found in Mech et al. (2019) (doi:10.5194/amt-12-5019-2019
Microwave brightness temperature measurements during the AFLUX Arctic airborne campaign in spring 2019 out of Svalbard
No full textThe data set contains measurements performed by the passive radiometer as part of the Microwave Radar and radiometer for Arctic Clouds (MiRAC; Mech et al., 2019) operated on board the Polar 5 research aircraft during 14 flights of the Airborne measurements of radiative and turbulent FLUXes of energy and momentum in the Arctic boundary layer (AFLUX; Mech et al., 2022) campaign, carried out in spring 2019 northwest of Svalbard (Norway). The measurement campaign is embedded in the Transregional Collaborative Research Centre TR 172 (ArctiC Amplification: Climate Relevant Atmospheric and SurfaCe Processes, and Feedback Mechanisms (AC)3. The published data set consists of brightness temperature measurements at nadir view with respect to the aircraft's fuselage at six frequencies in the water vapor absorption band at around 183.31 GHz and at two additional channels at 243 and 340 GHz. It should be considered that the brightness temperatures have not been corrected for aircraft attitude. The data set has been quality-checked and is available in NetCDF format for each flight separately.
Details on the instrument can be found in Mech et al. (2019) and on the dataset and its usage in Mech et al. (2022)
Microwave brightness temperature measurements during the MOSAiC-ACA Arctic airborne campaign in late summer 2020 out of Svalbard
No full textThe data set contains measurements performed by the passive radiometer Humidity And Temperature PROfiler (HATPRO; Rose et al., 2005) operated on board the Polar 5 research aircraft during 9 flights of the Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) Airborne observations in the Central Arctic (MOSAiC-ACA; Mech et al., 2022) campaign, carried out in late summer 2020 northwest of Svalbard (Norway). The measurement campaign is embedded in the Transregional Collaborative Research Centre TR 172 (ArctiC Amplification: Climate Relevant Atmospheric and SurfaCe Processes, and Feedback Mechanisms (AC)3. The published data set consists of brightness temperature measurements at nadir view with respect to the aircraft's fuselage at seven frequencies in the 22.24 GHz water vapor absorption band and seven at the 60 GHz oxygen absorption complex. It should be considered that the brightness temperatures have not been corrected for aircraft attitude. The data set has been quality-checked and is available in NetCDF format for each flight separately.
Details on the dataset and its usage can be found in Mech et al. (2022)
Radar reflectivities at 94 GHz and microwave brightness temperature measurements at 89 GHz during the HAMAG Arctic airborne campaign
No full textThe published data set consists of measurements performed by the active cloud radar as part of the Microwave Radar and radiometer for Arctic Clouds (MiRAC; Mech et al., 2019) operated on board the Polar 6 research aircraft during 6 flights of the HAMAG (Humidity profiles and Arctic Mixed-phase clouds as seen by Airborne W- and G-band radars) airborne campaign, carried out in February 2024 out of Kiruna (Sweden). The measurement campaign is embedded in the Transregional Collaborative Research Centre TR 172 (ArctiC Amplification: Climate Relevant Atmospheric and SurfaCe Processes, and Feedback Mechanisms (AC)3. The published data set comprises radar reflectivities from the FMCW 94 GHz cloud radar and brightness temperature measurements at 89 GHz, both with a 25-degree backward inclination relative to the aircraft's fuselage. The dataset has been quality-checked and is available in NetCDF format for each flight. Details on the instrument can be found in Mech et al. (2019)
Radar reflectivities at 94 GHz and microwave brightness temperature measurements at 89 GHz during the ACLOUD Arctic airborne campaign in early summer 2017 out of Svalbard
No full textThe published data set consists of measurements performed by the active cloud radar as part of the Microwave Radar and radiometer for Arctic Clouds (MiRAC; Mech et al., 2019) operated on board the Polar 5 research aircraft during 19 flights of the Arctic CLoud Observations Using airborne measurements during polar Day (ACLOUD) campaign, carried out in early summer 2017 northwest of Svalbard (Norway). The measurement campaign is embedded in the Transregional Collaborative Research Centre TR 172 (ArctiC Amplification: Climate Relevant Atmospheric and SurfaCe Processes, and Feedback Mechanisms (AC)3. The published data set consists of radar reflectivities of the FMCW 94 GHz cloud radar transformed to nadir view as well as brightness temperature measurements at 89 GHz with a 25 deg backward inclination with respect to the aircraft's fuselage. The data set has been quality-checked and is available in NetCDF format for each flight separately
Microwave brightness temperature measurements during the ACLOUD Arctic airborne campaign in early summer 2017 out of Svalbard
No full textThe data set contains measurements performed by the passive radiometer as part of the Microwave Radar and radiometer for Arctic Clouds (MiRAC; Mech et al., 2019) operated on board the Polar 5 research aircraft during 19 flights of the Arctic CLoud Observations Using airborne measurements during polar Day (ACLOUD) campaign, carried out in early summer 2017 northwest of Svalbard (Norway). The measurement campaign is embedded in the Transregional Collaborative Research Centre TR 172 (ArctiC Amplification: Climate Relevant Atmospheric and SurfaCe Processes, and Feedback Mechanisms (AC)3. The published data set consists of brightness temperature measurements at nadir view with respect to the aircraft's fuselage at six frequencies in the water vapor absorption band at around 183.31 GHz and two additional channels at 243 and 340 GHz. It should be considered that the brightness temperatures have not been corrected for aircraft attitude. The data set has been quality-checked and is available in NetCDF format for each flight separately.
Details on the instrument can be found in Mech et al. (2019)
- …
