Skip Navigation


JPL Laser Hygrometer

JPL Laser Hygrometer Project Logo

The JPL Laser Hygrometer measures in-situ water vapor from aircraft platforms in the upper troposphere and lower stratosphere. These platforms are the Northrop Grumman Aerospace Systems GII aircraft and NASA aircraft including ER-2, WB-57, DC-8, and Global Hawk. The most recent project is the Northrop Grumman Upper Tropospheric Measurements campaign. The JPL Laser Hygrometer also participated in the NASA Studies of Emissions and Atmospheric Composition, Clouds and Climate Coupling by Regional Surveys (SEAC4RS) field mission.


  • Herman, R. L., Ray, E. A., Rosenlof, K. H., Bedka, K. M., Schwartz, M. J., Read, W. G., Troy, R. F., Chin, K., Christensen, L. E., Fu, D., Stachnik, R. A., Bui, T. P., and Dean-Day, J. M., “Enhanced Stratospheric Water Vapor over the Summertime Continental United States and the Role of Overshooting Convection,” Atmos. Chem. Phys., 17, 6113-6124, 2017,
  • Fahey, D. W., Gao, R.-S., Möhler, O., Saathoff, H., Schiller, C., Ebert, V., Krämer, M., Peter, T., Amarouche, N., Avallone, L. M., Bauer, R., Bozóki, Z., Christensen, L. E., Davis, S. M., Durry, G., Dyroff, C., Herman, R. L., Hunsmann, S., Khaykin, S., Mackrodt, P., Meyer, J., Smith, J. B., Spelten, N., Troy, R. F., Vömel, H., Wagner, S., and Weinhold, F. G., “The AquaVIT-1 Intercomparison of Atmospheric Water Vapor Measurement Techniques,” Atmos. Meas. Tech., 7, 3177-3213, doi:10.5194/amt-7-3177-2014, 2014.


Photo of Robert Herman
Robert Herman
Tropospheric Composition - Scientist