HIPLEX-1: Experimental Design and Response Variables

Paul L. Smith Institute of Atmospheric Sciences, South Dakota School of Mines and Technology, Rapid City, SD 57701

Search for other papers by Paul L. Smith in
Current site
Google Scholar
PubMed
Close
,
Arnett S. Dennis Division of Atmospheric Resources Research, U.S. Bureau of Reclamation, Denver, CO 80225

Search for other papers by Arnett S. Dennis in
Current site
Google Scholar
PubMed
Close
,
Bernard A. Silverman Division of Atmospheric Resources Research, U.S. Bureau of Reclamation, Denver, CO 80225

Search for other papers by Bernard A. Silverman in
Current site
Google Scholar
PubMed
Close
,
Arlin B. Super U.S. Bureau of Reclamation, Montrose, CO 81401

Search for other papers by Arlin B. Super in
Current site
Google Scholar
PubMed
Close
,
Edmond W. Holroyd III U.S. Bureau of Reclamation, Montrose, CO 81401

Search for other papers by Edmond W. Holroyd III in
Current site
Google Scholar
PubMed
Close
,
William A. Cooper University of Wyoming, Laramie, WY 82070

Search for other papers by William A. Cooper in
Current site
Google Scholar
PubMed
Close
,
Paul W. Mielke Jr. Colorado State University, Ft. Collins, CO 80523

Search for other papers by Paul W. Mielke Jr. in
Current site
Google Scholar
PubMed
Close
,
Kenneth J. Berry Colorado State University, Ft. Collins, CO 80523

Search for other papers by Kenneth J. Berry in
Current site
Google Scholar
PubMed
Close
,
Harold D. Orville Institute of Atmospheric Sciences, South Dakota School of Mines and Technology, Rapid City, SD 57701

Search for other papers by Harold D. Orville in
Current site
Google Scholar
PubMed
Close
, and
James R. Miller Jr. Institute of Atmospheric Sciences, South Dakota School of Mines and Technology, Rapid City, SD 57701

Search for other papers by James R. Miller Jr. in
Current site
Google Scholar
PubMed
Close
Full access

Abstract

The design and conduct of HIPLEX-1, a randomized seeding experiment carried out on small cumulus congestus clouds in eastern Montana, are outlined. The seeding agent was dry ice, introduced in an effort to produce microphysical effects, especially the earlier formation of precipitation in the seeded clouds. The earlier formation was expected to increase both the probability and the amount of precipitation from those small clouds with short lifetimes. The experimental unit selection procedure, treatment and randomization procedures, the physical hypothesis, measurement procedures and the response variables defined for the experiment are discussed. Procedures used to calculate the response variables from aircraft and radar measurements are summarized and the values of those variables for the 20 HIPLEX-1 test cases from 1979 and 1980 are tabulated.

Abstract

The design and conduct of HIPLEX-1, a randomized seeding experiment carried out on small cumulus congestus clouds in eastern Montana, are outlined. The seeding agent was dry ice, introduced in an effort to produce microphysical effects, especially the earlier formation of precipitation in the seeded clouds. The earlier formation was expected to increase both the probability and the amount of precipitation from those small clouds with short lifetimes. The experimental unit selection procedure, treatment and randomization procedures, the physical hypothesis, measurement procedures and the response variables defined for the experiment are discussed. Procedures used to calculate the response variables from aircraft and radar measurements are summarized and the values of those variables for the 20 HIPLEX-1 test cases from 1979 and 1980 are tabulated.

Save