life in the atacamacarnegie mellon atacama weather july 29, 2003 fayette shaw michael wagner...
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Life in the Atacama Carnegie Mellon
Atacama Weather
July 29, 2003
Fayette ShawMichael Wagner
Robotics Institute
Atacama Weather
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Life in the Atacama Carnegie Mellon
Weather Station Purpose
Record the weather at the site to answer science and engineering questions
•What environmental conditions are expected during the mission?
•How do these conditions affect rover performance and configuration?
•How do these conditions correlate with the existence of microorganisms?
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Life in the Atacama Carnegie Mellon
Weather Station
Variables continuously logged the following from April 11 to 26:• Temperature• Relative Humidity• Wind Direction and Speed• Insolation
•Campbell Scientific CM3 Pyranometer•Directed Perception PTU and solar panels
• Data logging•Campbell Scientific CM10 data unit
Analogous to a lander
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Life in the Atacama Carnegie Mellon
Temperature
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Life in the Atacama Carnegie Mellon
Temperature – Statistics
Peak temperature was 30.02º C April 10th
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Life in the Atacama Carnegie Mellon
Humidity
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Life in the Atacama Carnegie Mellon
Humidity Example for a Single Day
Humidity peaks at night reaching > 90%
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Life in the Atacama Carnegie Mellon
Relative Humidity – Statistics
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Life in the Atacama Carnegie Mellon
Wind Speed
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Life in the Atacama Carnegie Mellon
N
E
S
W
N
Win
d D
irect
ion
Wind Direction
April 18th
the day the robot almost fell off the edge the earth
Max speed @ weather station: 32 kph (9 m/s)Max speed @ robot: ~55 kph (15.3 m/s)
N
W E
S
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Life in the Atacama Carnegie Mellon
N
E
S
W
N
Win
d D
irect
ion
Example for a Single Day
Afternoon wind trend
High winds in the afternoon 32.5 kph (9 m/s)
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Life in the Atacama Carnegie Mellon
Wind Speed - Statistics
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Life in the Atacama Carnegie Mellon
Dust Devil
Photo taken April 25th by Trey Smith
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Life in the Atacama Carnegie Mellon
Insolation
Overcast day followed by missing data
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Life in the Atacama Carnegie Mellon
Insolation – Clear day Statistics
Characteristic Clear Day Curve
April 10, 12, 13, 17, 18, 19, 20, 21
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Life in the Atacama Carnegie Mellon
Characteristic Insolation Curves
Partly Cloudy: April 11, 15, 16, 22, 24, 25, 26
Partly Cloudy
Overcast: April 23
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Life in the Atacama Carnegie Mellon
Trends
Seasonal Trends
•Since April is autumn in the Southern Hemisphere:
•Decreasing temperature
•Decreasing insolation
•Increasing cloud cover
Daily Trends
•Afternoon: NNW wind
•Night: humidity
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Life in the Atacama Carnegie Mellon
Future Analysis
Refine design parameters for rover•Wind speed sensor•Leaf sensor to measure condensation•Consider maximum temperature for sensors
•Alter solar panel configuration based on insolation and wind data
Construct mission operations based on environmental characteristics
•Avoid or operate at certain times based on
Afternoon windInsolationHumidity
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Life in the Atacama Carnegie Mellon
Recommendations for Weather StationPower Manager and User Interface
•Decrease daily power consumption while maximizing data logged
Power each component separately
Monitor battery power and shut off components accordingly to prevent abrupt powerdown
•User-friendly interface to control station
Software•Automatic photospectrometer operation•Logging software which separates data by day and instrument. Automate generation of graphs
Francisco Calderon P. and Allan Luders M.