Yellow markers indicate discontinued sites
Array ( [0] => Array ( [num] => 353 [code] => AAO [name] => Airborne Aerosol Observatory, Bondville, Illinois [country] => United States [lat] => 40.0500 [lon] => -88.3700 [elev] => 230.00 [lst2utc] => 6.0 [flag] => UNST0001.GIF [description] => [coop_name] => NOAA Earth System Research Laboratory, Global Monitoring Division [project] => Array ( [0] => Array ( [0] => 2 [1] => Airborne Flasks [2] => 3 ) ) [active] => 0 [binned] => 0 ) [1] => Array ( [num] => 482 [code] => ACG [name] => Alaska Coast Guard [country] => United States [lat] => 57.7366 [lon] => -152.5042 [elev] => 6.00 [lst2utc] => 8.0 [flag] => [description] => [coop_name] => United States Coast Guard, Air Station Kodiak [project] => Array ( [0] => Array ( [0] => 2 [1] => Airborne Flasks [2] => 3 ) ) [active] => 0 [binned] => 0 ) [2] => Array ( [num] => 436 [code] => BAO [name] => Boulder Atmospheric Observatory, Colorado [country] => United States [lat] => 40.0500 [lon] => -105.0040 [elev] => 1584.00 [lst2utc] => 7.0 [flag] => UNST0001.GIF [description] => The BAO research facility in Erie, Colorado is used for studying the planetary boundary layer and for testing and calibrating atmospheric sensors. Ongoing measurements include solar radiation and greenhouse gases. The centerpiece of the facility is a 300-m tower instrumented at multiple levels with slow-response temperature, relative humidity and wind sensors, a profiling instrument carriage, a variety of remote sensing systems, and a real-time processing and display capability. [coop_name] => Private Party; ESRL Physical Sciences Division; NOAA Earth System Research Laboratory, Global Monitoring Division [project] => Array ( [0] => Array ( [0] => 2 [1] => Airborne Flasks [2] => 3 ) ) [active] => 0 [binned] => 0 ) [3] => Array ( [num] => 303 [code] => BGI [name] => Bradgate, Iowa [country] => United States [lat] => 42.8200 [lon] => -94.4100 [elev] => 355.10 [lst2utc] => 6.0 [flag] => UNST0001.GIF [description] => [coop_name] => Hap's Air Service [project] => Array ( [0] => Array ( [0] => 2 [1] => Airborne Flasks [2] => 3 ) ) [active] => 0 [binned] => 0 ) [4] => Array ( [num] => 305 [code] => BNE [name] => Beaver Crossing, Nebraska [country] => United States [lat] => 40.8000 [lon] => -97.1800 [elev] => 465.90 [lst2utc] => 6.0 [flag] => UNST0001.GIF [description] => [coop_name] => Hap's Air Service [project] => Array ( [0] => Array ( [0] => 2 [1] => Airborne Flasks [2] => 3 ) ) [active] => 0 [binned] => 0 ) [5] => Array ( [num] => 18 [code] => CAR [name] => Briggsdale, Colorado [country] => United States [lat] => 40.6347 [lon] => -104.3269 [elev] => 1488.00 [lst2utc] => 7.0 [flag] => UNST0001.GIF [description] => [coop_name] => Scientific Aviation [project] => Array ( [0] => Array ( [0] => 2 [1] => Airborne Flasks [2] => 1 ) ) [active] => 1 [binned] => 0 ) [6] => Array ( [num] => 313 [code] => CMA [name] => Offshore Cape May, New Jersey [country] => United States [lat] => 38.8300 [lon] => -74.3200 [elev] => 0.00 [lst2utc] => 5.0 [flag] => UNST0001.GIF [description] => [coop_name] => AirTec, Inc [project] => Array ( [0] => Array ( [0] => 2 [1] => Airborne Flasks [2] => 1 ) ) [active] => 1 [binned] => 0 ) [7] => Array ( [num] => 522 [code] => CRV [name] => Carbon in Arctic Reservoirs Vulnerability Experiment (CARVE) [country] => United States [lat] => 64.9863 [lon] => -147.5980 [elev] => 611.43 [lst2utc] => 8.0 [flag] => UNST0001.GIF [description] => [coop_name] => NASA Terrestrial Ecology Program; NOAA/NESDIS/OSPO/FCDAS [project] => Array ( [0] => Array ( [0] => 2 [1] => Airborne Flasks [2] => 3 ) ) [active] => 0 [binned] => 0 ) [8] => Array ( [num] => 306 [code] => DND [name] => Dahlen, North Dakota [country] => United States [lat] => 47.5000 [lon] => -99.2400 [elev] => 472.44 [lst2utc] => 6.0 [flag] => UNST0001.GIF [description] => [coop_name] => FARGO JET CENTER [project] => Array ( [0] => Array ( [0] => 2 [1] => Airborne Flasks [2] => 1 ) ) [active] => 1 [binned] => 0 ) [9] => Array ( [num] => 36 [code] => ESP [name] => Estevan Point, British Columbia [country] => Canada [lat] => 49.3830 [lon] => -126.5441 [elev] => 7.00 [lst2utc] => 8.0 [flag] => CANA0001.GIF [description] => [coop_name] => Private Party [project] => Array ( [0] => Array ( [0] => 2 [1] => Airborne Flasks [2] => 1 ) ) [active] => 1 [binned] => 0 ) [10] => Array ( [num] => 315 [code] => ETL [name] => East Trout Lake, Saskatchewan [country] => Canada [lat] => 54.3541 [lon] => -104.9868 [elev] => 493.00 [lst2utc] => 6.0 [flag] => CANA0001.GIF [description] => The East Trout Lake observatory is located 150 km North of Prince Albert close to the southern edge of a boreal forest region in central Saskatchewan. [coop_name] => Environment Canada [project] => Array ( [0] => Array ( [0] => 2 [1] => Airborne Flasks [2] => 1 ) ) [active] => 1 [binned] => 0 ) [11] => Array ( [num] => 39 [code] => FTL [name] => Fortaleza [country] => Brazil [lat] => -3.5200 [lon] => -38.2800 [elev] => 3.00 [lst2utc] => 3.0 [flag] => BRAZ0001.GIF [description] => [coop_name] => LBA INPE/CPTEC [project] => Array ( [0] => Array ( [0] => 2 [1] => Airborne Flasks [2] => 3 ) ) [active] => 0 [binned] => 0 ) [12] => Array ( [num] => 307 [code] => FWI [name] => Fairchild, Wisconsin [country] => United States [lat] => 44.6600 [lon] => -90.9600 [elev] => 334.30 [lst2utc] => 6.0 [flag] => UNST0001.GIF [description] => [coop_name] => Hap's Air Service [project] => Array ( [0] => Array ( [0] => 2 [1] => Airborne Flasks [2] => 3 ) ) [active] => 0 [binned] => 0 ) [13] => Array ( [num] => 44 [code] => HAA [name] => Molokai Island, Hawaii [country] => United States [lat] => 21.2300 [lon] => -158.9500 [elev] => 3.00 [lst2utc] => 10.0 [flag] => UNST0001.GIF [description] => Air samples collected in PFP's as part of MOPITT. [coop_name] => Pacific Air Charters, Inc. [project] => Array ( [0] => Array ( [0] => 2 [1] => Airborne Flasks [2] => 3 ) ) [active] => 0 [binned] => 0 ) [14] => Array ( [num] => 48 [code] => HFM [name] => Harvard Forest, Massachusetts [country] => United States [lat] => 42.5378 [lon] => -72.1714 [elev] => 340.00 [lst2utc] => 5.0 [flag] => UNST0001.GIF [description] => Harvard Forest is a 1200 hectares, aggrading, temperate, 50 to 70 year old, mixed deciduous forest with moderately hilly terrain. The physical plant includes Shaler Hall, a brick building with offices, research laboratories, seminar room, the Harvard Forest archives, a library of 22,000 volumes, and the Fisher Museum with panoramic displays. In addition, it has dormitory accomodations for twenty-five persons and dining room and kitchen facilities, photographic suite and darkroom, a graphics and mapping room, a projection and film analysis room for video microscopy, and micro computers. Also, there are two greenhouses, the Director's house (David Foster), and four residences for research staff and their families. Also, there's the woods crew of three men, the forest manager and their back-hoe, bulldozer, tractor, crawler, dump truck, flat bed truck, pick up and van, wood working shop, and a sawmill. [coop_name] => FOUR STAR AVIATION; Boston University [project] => Array ( [0] => Array ( [0] => 2 [1] => Airborne Flasks [2] => 3 ) ) [active] => 0 [binned] => 0 ) [15] => Array ( [num] => 308 [code] => HIL [name] => Homer, Illinois [country] => United States [lat] => 40.0700 [lon] => -87.9100 [elev] => 201.50 [lst2utc] => 6.0 [flag] => UNST0001.GIF [description] => [coop_name] => M & M Aviation Services, Ltd. [project] => Array ( [0] => Array ( [0] => 2 [1] => Airborne Flasks [2] => 1 ) ) [active] => 1 [binned] => 0 ) [16] => Array ( [num] => 506 [code] => INX [name] => INFLUX (Indianapolis Flux Experiment) [country] => United States [lat] => 39.5805 [lon] => -86.4207 [elev] => -9999.99 [lst2utc] => 5.0 [flag] => [description] => [coop_name] => Purdue University [project] => Array ( [0] => Array ( [0] => 2 [1] => Airborne Flasks [2] => 3 ) ) [active] => 0 [binned] => 0 ) [17] => Array ( [num] => 62 [code] => LEF [name] => Park Falls, Wisconsin [country] => United States [lat] => 45.9451 [lon] => -90.2732 [elev] => 472.00 [lst2utc] => 6.0 [flag] => UNST0001.GIF [description] => [coop_name] => Wisconsin Educational Communications Board & US Forest Service; MBMAS; USDA Forest Service Forestry Sciences Laboratory; USDA Forest Service [project] => Array ( [0] => Array ( [0] => 2 [1] => Airborne Flasks [2] => 1 ) ) [active] => 1 [binned] => 0 ) [18] => Array ( [num] => 281 [code] => NHA [name] => Offshore Portsmouth, New Hampshire (Isles of Shoals) [country] => United States [lat] => 42.9500 [lon] => -70.6300 [elev] => 0.00 [lst2utc] => 5.0 [flag] => UNST0001.GIF [description] => [coop_name] => Private Party [project] => Array ( [0] => Array ( [0] => 2 [1] => Airborne Flasks [2] => 1 ) ) [active] => 1 [binned] => 0 ) [19] => Array ( [num] => 309 [code] => OIL [name] => Oglesby, Illinois [country] => United States [lat] => 41.2800 [lon] => -88.9400 [elev] => 192.60 [lst2utc] => 6.0 [flag] => UNST0001.GIF [description] => [coop_name] => MIDWEST AVTECH [project] => Array ( [0] => Array ( [0] => 2 [1] => Airborne Flasks [2] => 3 ) ) [active] => 0 [binned] => 0 ) [20] => Array ( [num] => 89 [code] => PFA [name] => Poker Flat, Alaska [country] => United States [lat] => 64.9000 [lon] => -148.7600 [elev] => 210.00 [lst2utc] => 9.0 [flag] => UNST0001.GIF [description] => [coop_name] => Warbelows Air Ventures, Inc. [project] => Array ( [0] => Array ( [0] => 2 [1] => Airborne Flasks [2] => 1 ) ) [active] => 1 [binned] => 0 ) [21] => Array ( [num] => 99 [code] => RTA [name] => Rarotonga [country] => Cook Islands [lat] => -21.2500 [lon] => -159.8300 [elev] => 3.00 [lst2utc] => 10.0 [flag] => CKIS0001.GIF [description] => [coop_name] => Air Rarotonga LTD. [project] => Array ( [0] => Array ( [0] => 2 [1] => Airborne Flasks [2] => 1 ) ) [active] => 1 [binned] => 0 ) [22] => Array ( [num] => 101 [code] => SAN [name] => Santarem [country] => Brazil [lat] => -2.8500 [lon] => -54.9500 [elev] => 78.00 [lst2utc] => 4.0 [flag] => BRAZ0001.GIF [description] => [coop_name] => LBA INPE/CPTEC [project] => Array ( [0] => Array ( [0] => 2 [1] => Airborne Flasks [2] => 3 ) ) [active] => 0 [binned] => 0 ) [23] => Array ( [num] => 279 [code] => SCA [name] => Offshore Charleston, South Carolina [country] => United States [lat] => 32.7700 [lon] => -79.5500 [elev] => 0.00 [lst2utc] => 5.0 [flag] => UNST0001.GIF [description] => [coop_name] => Orion Aviation [project] => Array ( [0] => Array ( [0] => 2 [1] => Airborne Flasks [2] => 1 ) ) [active] => 1 [binned] => 0 ) [24] => Array ( [num] => 108 [code] => SGP [name] => Southern Great Plains, Oklahoma [country] => United States [lat] => 36.6070 [lon] => -97.4890 [elev] => 314.00 [lst2utc] => 6.0 [flag] => UNST0001.GIF [description] => The sampling site is located in the Southern Great Plains, within the US DOE Atmospheric Radiation Measurement Program testbed. The testbed is a 350 km x 350 km area studied and modeled by ARM. It is officially called the ARM-CART (cloud and radiation testbed). The local topography is very flat. Land use is mostly agriculture; main land cover is winter wheat and pasture. Scientists are using the information obtained from the SGP site to improve cloud and radiative models and parameterizations and, thereby, the performance of atmospheric general circulation models used for climate research. There are 30 scientists and technicians who collect and monitor data from the central facility instruments and from remote instruments throughout the site. The SGP is the largest and most extensive climate research field site in the world. [coop_name] => Lawrence Berkeley National Laboratory [project] => Array ( [0] => Array ( [0] => 2 [1] => Airborne Flasks [2] => 1 ) ) [active] => 1 [binned] => 0 ) [25] => Array ( [num] => 280 [code] => TGC [name] => Offshore Corpus Christi, Texas [country] => United States [lat] => 27.7300 [lon] => -96.8600 [elev] => 0.00 [lst2utc] => 6.0 [flag] => UNST0001.GIF [description] => [coop_name] => Skypark Aviation [project] => Array ( [0] => Array ( [0] => 2 [1] => Airborne Flasks [2] => 1 ) ) [active] => 1 [binned] => 0 ) [26] => Array ( [num] => 124 [code] => THD [name] => Trinidad Head, California [country] => United States [lat] => 41.0541 [lon] => -124.1510 [elev] => 107.00 [lst2utc] => 8.0 [flag] => UNST0001.GIF [description] =>

Trinidad Head Observatory (THD) is located on a point jutting into the ocean along the remote northern coast of California approximately 40 km (25 miles) north of Eureka, California, the main regional population center. The coastal climate is dominated by maritime influences, with moderate year-round temperatures and moderate-to-high humidity. To the immediate west of Trinidad Head is the unobstructed Pacific Ocean. To the east, the coastal range is dominated by redwood forests. The town of Trinidad represents the primary community in the immediate vicinity and supports approximately 400 year-round residents. The Telonicher Marine Laboratory (TML), a satellite facility of Humboldt State University (HSU), is also located in Trinidad.

NOAA established an atmospheric baseline observatory at Trinidad Head in 2002. Because of its relatively remote coastal location and prevailing maritime airflow, NOAA felt the site would provide scientists with an opportunity to observe and monitor both regional and global atmospheric conditions reasonably free from local influences.

An instrument trailer was installed in April 2002 allowing measurements of aerosols, surface ozone, radiation, and flask sampling for halocarbons and carbon cycle gases. Bi-weekly airborne vertical profile measurements provide a continuous baseline of pollution and climate forcing agents in air entering the U.S. Co-located with the Trinidad Head Observatory, the Scripps Institution of Oceanography operates two in situ instruments, one as part of the Advanced Global Atmospheric Gases Experiment (AGAGE), the other for measuring changes in atmospheric oxygen concentrations.

The NOAA Trinidad Head Atmospheric Baseline Observatory was downgraded from its status as a full “Observatory” to a “Sampling Site” on June 5, 2017. Most long-term projects and infrastructure were removed from the site. Three research projects remain at THD in partnership with other entities: surface ozone monitoring instrumentation (partnership with SIO), ozonesonde launching capabilities (partnership with HSU), and halocarbons flask sampling capabilities (partnership with AGAGE). The downgrade follows a Global Monitoring Division-wide evaluation of scientific goals and global observing network capabilities that resulted in realignment to best meet NOAA’s mission and the nation’s scientific needs.

All Trinidad Head data are available on the Global Monitoring Division’s website: https://esrl.noaa.gov/gmd/dv/data/index.php?site=thd

[coop_name] => Scientific Aviation, Inc; NOAA Earth System Research Laboratory, Global Monitoring Division [project] => Array ( [0] => Array ( [0] => 2 [1] => Airborne Flasks [2] => 1 ) ) [active] => 1 [binned] => 0 ) [27] => Array ( [num] => 287 [code] => ULB [name] => Ulaanbaatar [country] => Mongolia [lat] => 47.4000 [lon] => 106.0000 [elev] => 1350.00 [lst2utc] => -8.0 [flag] => MONG0001.GIF [description] => [coop_name] => Mongolian Hydrometeorological Research Institute [project] => Array ( [0] => Array ( [0] => 2 [1] => Airborne Flasks [2] => 3 ) ) [active] => 0 [binned] => 0 ) [28] => Array ( [num] => 406 [code] => WBI [name] => West Branch, Iowa [country] => United States [lat] => 41.7248 [lon] => -91.3529 [elev] => 241.70 [lst2utc] => 6.0 [flag] => UNST0001.GIF [description] => [coop_name] => M & M Aviation Services, Ltd.; University of Iowa [project] => Array ( [0] => Array ( [0] => 2 [1] => Airborne Flasks [2] => 1 ) ) [active] => 1 [binned] => 0 ) [29] => Array ( [num] => 438 [code] => WGC [name] => Walnut Grove, California [country] => United States [lat] => 38.2650 [lon] => -121.4911 [elev] => 0.00 [lst2utc] => 8.0 [flag] => UNST0001.GIF [description] => [coop_name] => Lawrence Berkeley National Laboratory; DOE Environmental Energy Technologies Division at Lawrence Berkeley National Laboratory; KalScott Engineering [project] => Array ( [0] => Array ( [0] => 2 [1] => Airborne Flasks [2] => 3 ) ) [active] => 0 [binned] => 0 ) )