Microbarograph. A Weathertronics, Incorporated (Sacramento, CA), 

 recording aneroid sensor (microbarograph) located in the laboratory building was 

 also used to continuously record atmospheric pressine variation. 



The microbarograph was compared daily with the NWS aneroid 

 barometer, and adjustments were made as necessary. Maintenance of the 

 microbarograph consisted of inking the pen, changing the chart paper, and winding 

 the clock every 7 days. During the summer, a meteorologist from the NWS 

 checked and verified the operation of the barometer. 



The microbarograph was read and inspected daily using the following 

 procedure: 



a. The pen was zeroed (where applicable). 



b. The chart time was checked and corrected, if necessary. 



c. The daily reading was marked on the chart for reference. 



d. The starting and ending chart times were recorded, as necessary. 



e. New charts were installed, when needed. 



Results 



Daily and average atmospheric pressure values are presented in 

 Figure 4, and summary statistics are presented in Table 2. 





1040 





1035 



E 



1030 





1025 



D 





U> 



m 



1020 



<V 





o 



1015 



r 



1010 



a 





o 

 E 



1005 



< 



1000 





995 





990 



Year Mean, mb 



X k1995 1016.6 



9— -©1983-95 1016.9 



JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 

 Month 



Figure 4. Daily barometric pressure values with monthly means 



Chapter 2 Meteorology 



