439
(1982) found evidence that Asian deserts are the source of crust AI material arriving at
Mauna Loa Observatory, Hawaii. Halter and Harris (1983) investigated causes for CO 2
variability at Barrow, Alaska, using trajectories and other analysis methods. A study in
Harris and Bodhaine (1983) found that pollution episodes at Whiteface Mountain
Observatory, NY, were often associated with trajectories arriving from the west after
passing over the Great Lakes industrial region, and clean air conditions at the Observatory
were associated with trajectories over the Atlantic. A 7-year back-trajectory climatology by
Miller and Harris (1985) characterized airflow to the island of Bermuda and found a strong
positive correlation between highly acidic rainfall and the trajectories from the North
American continent.
Five-day back trajectories were computed for Izaiia on the 850- and 7oo-HPa
pressure surfaces. They were displayed on a map with symbols along each track to identify
the level and the number of days back. We used these mandatory pressure levels because
the altitude of the Izafia station (2367 m) falls between them. The period of study was from
January 1983 to December 1987. Over 7000 individual backward trajectories were
computed.
2. Geographical and Meteorological features of the site. Classification of Izana backtrajectories.
Izaiia baseline Observatory belongs to the World Meteorological Organization's
worldwide Back-ground Air Pollution Monitoring Network (BAPMoN), which measures
background levels of various atmospheric constituents. It is the only baseline station in the
North Atlantic region and has been operational since 1984. The Izaiia baseline station
(28°18' N, 16° 29' W) is on a mountain platform at 2367 m above sea level on Tenerife
Island, 400 km west of Africa. The Observatory is on a natural volcanic platform (Montaiia
de Izaiia) in the middle of the mountainous ridge that runs from the Caldera de Las
Cafiadas, on the base of the volcanic cone of Pico del Teide (3717 m), toward the northeast
side of Tenerife island. Sparse vegetation grows at this altitude. However, a lush pine-tree
forest exists between 1200 and 2000m altitude, and laurel forest (laurisilva) continues
downward. The most important "green" area close to the Observatory is in a valley
northwest of Izaiia (Valle de la Orotava).
(1982) found evidence that Asian deserts are the source of crust AI material arriving at
Mauna Loa Observatory, Hawaii. Halter and Harris (1983) investigated causes for CO 2
variability at Barrow, Alaska, using trajectories and other analysis methods. A study in
Harris and Bodhaine (1983) found that pollution episodes at Whiteface Mountain
Observatory, NY, were often associated with trajectories arriving from the west after
passing over the Great Lakes industrial region, and clean air conditions at the Observatory
were associated with trajectories over the Atlantic. A 7-year back-trajectory climatology by
Miller and Harris (1985) characterized airflow to the island of Bermuda and found a strong
positive correlation between highly acidic rainfall and the trajectories from the North
American continent.
Five-day back trajectories were computed for Izaiia on the 850- and 7oo-HPa
pressure surfaces. They were displayed on a map with symbols along each track to identify
the level and the number of days back. We used these mandatory pressure levels because
the altitude of the Izafia station (2367 m) falls between them. The period of study was from
January 1983 to December 1987. Over 7000 individual backward trajectories were
computed.
2. Geographical and Meteorological features of the site. Classification of Izana backtrajectories.
Izaiia baseline Observatory belongs to the World Meteorological Organization's
worldwide Back-ground Air Pollution Monitoring Network (BAPMoN), which measures
background levels of various atmospheric constituents. It is the only baseline station in the
North Atlantic region and has been operational since 1984. The Izaiia baseline station
(28°18' N, 16° 29' W) is on a mountain platform at 2367 m above sea level on Tenerife
Island, 400 km west of Africa. The Observatory is on a natural volcanic platform (Montaiia
de Izaiia) in the middle of the mountainous ridge that runs from the Caldera de Las
Cafiadas, on the base of the volcanic cone of Pico del Teide (3717 m), toward the northeast
side of Tenerife island. Sparse vegetation grows at this altitude. However, a lush pine-tree
forest exists between 1200 and 2000m altitude, and laurel forest (laurisilva) continues
downward. The most important "green" area close to the Observatory is in a valley
northwest of Izaiia (Valle de la Orotava).