{"id":892,"date":"2022-02-01T17:40:20","date_gmt":"2022-02-01T17:40:20","guid":{"rendered":"https:\/\/www.pearl-candac.ca\/website\/?page_id=892"},"modified":"2024-03-08T16:17:05","modified_gmt":"2024-03-08T16:17:05","slug":"flux-tower","status":"publish","type":"page","link":"https:\/\/www.pearl-candac.ca\/website\/index.php\/instrumentation\/flux-tower\/","title":{"rendered":"Flux Tower"},"content":{"rendered":"\n

For more information about the Flux Tower and data, please, contact CANDAC\/PEARL site manager <\/em><\/strong>Dr. Pierre Fogal<\/em><\/strong><\/a><\/p>\n\n\n\n

Data<\/strong>
Eureka Flux Tower data archive, NOAA PSL<\/a><\/p>\n\n\n\n

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Figure 1.  Photo of Eureka Flux Tower looking towards the NE.<\/strong><\/figcaption><\/figure><\/div>\n\n\n\n

Since 2007, a 10 m flux tower (FT) has been operated as a part of PEARL. The tower is erected approximately 250 m NNE of the East end of the Eureka runway. Geographical coordinates of the FT are 79.9955 N, 85.7716 W<\/a>. It is equipped with a suite of instruments to measure surface-atmosphere exchanges of energy and momentum by means of eddy covariance micro-meteorological method (Grachev et al., 2018<\/a>). The suite includes temperature sensors, a 3-cup anemometer and vane, sonic anemometers, precipitation sensors, barometers, radiometers, a soil probe, and a gas analyzer. The gas analyzer has been used to measure CO2<\/sub> and H2<\/sub>O concentrations in ambient air for better understanding of the atmosphere-surface CO2<\/sub> flux. In 2014 the instrument suite was complemented with a Paroscientific micro barometer mounted 1 m above the surface. The micro barometer measures the atmospheric surface pressure at a frequency of 50 Hz and a resolution of ~0.01 Pa to detect rapid pressure variations associated with the fast gravity wave oscillations which are common in the boundary layer during winter (Chimonas, 2002<\/a>). The FT instrumentation specification is given in Table 1.<\/p>\n\n\n\n

The FT began as a joint effort between the National Oceanic and Atmospheric Administration and CANDAC within the framework of activities of the International Arctic Systems for Observing the Atmosphere (IASOA)<\/a> to enhance Arctic atmospheric research (Uttal et al., 2016<\/a>).<\/p>\n\n\n\n

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Figure 2.  The Flux Tower sensors are getting cleaned by CANDAC operator.<\/strong><\/figcaption><\/figure><\/div>\n\n\n\n
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Table 1.  Eureka flux tower instrumentation.<\/strong><\/h5>\n\n\n\n
Instrument<\/strong><\/td>Model<\/strong><\/td>Measurement<\/strong><\/td>Level (m)<\/strong><\/td>Sampling rate<\/strong><\/td><\/tr>
3-cup sentry anemometer & vane<\/td>R.M. Young: 03001-L<\/td>wind speed & direction<\/td>11.1<\/td>1 min<\/td><\/tr>
High precision pyranometers<\/td>Kipp & Zonen: CM22<\/td>total shortwave irradiance, downwelling & upwelling<\/td>11.1<\/td>1 min<\/td><\/tr>
Precision infrared radiometer<\/td>Eppley:PIR<\/td>total longwave irradiance, downwelling & upwelling<\/td>11.1<\/td>1 min<\/td><\/tr>
Humidity and temperature meter<\/td>Vaisala: HMT337<\/td>air temperature & relative humidity<\/td>10.1; 6.1; 2.33<\/td>1 min<\/td><\/tr>
RTD temperature probe<\/td>Campbell Scientific: 43347<\/td>air temperature<\/td>9.75; 5.98; 2.33<\/td>3 Hz<\/td><\/tr>
Fine-wire thermocouple<\/td>Campbell Scientific: ASPTC-L<\/td>air temperature<\/td>9.1; 6.1; 2.33<\/td>1 min<\/td><\/tr>
Sonic anemometer<\/td>Metek: uSonic-3 Scientific<\/td>u, v, & w wind velocity, virtual temperature<\/td>7.54; 3.07<\/td>10 Hz<\/td><\/tr>
Gas analyzer<\/td>Licor: LI-7500<\/td>CO2<\/sub> & H2<\/sub>O concentration<\/td>8.0<\/td>10 Hz<\/td><\/tr>
Ultrasonic snow depth sensor<\/td>Campbell Scientific: SR50-L100<\/td>snow depth<\/td>2.3<\/td>1 min<\/td><\/tr>
Barometer<\/td>Campbell Scientific: CS105<\/td>atmospheric pressure<\/td>2.0<\/td>1 min<\/td><\/tr>
Precision infrared thermocouple sensor<\/td>Campbell Scientific: IRTS-P<\/td>ground surface temperature<\/td>3.2<\/td>1 min<\/td><\/tr>
Averaging soil thermocouple probe<\/td>Campbell Scientific: TCAV-L<\/td>ground temperature<\/td>\u22120.05<\/td>1 min<\/td><\/tr>
Soil heat flux plate<\/td>Campbell Scientific: HFT3-L<\/td>soil temperature gradient<\/td>\u22120.05<\/td>1 min<\/td><\/tr>
Thermistor string<\/td>MRC<\/td>active layer depth temperature<\/td>\u2212 0.05 to \u2212 1.2 <\/td>1 min<\/td><\/tr>
Microbarometer<\/td>Paroscientific: 6000-16B<\/td>atmospheric pressure<\/td>1.0<\/td>50 Hz<\/td><\/tr><\/tbody><\/table><\/figure>\n","protected":false},"excerpt":{"rendered":"

For more information about the Flux Tower and data, please, contact CANDAC\/PEARL site manager Dr. Pierre Fogal DataEureka Flux Tower data archive, NOAA PSL Since 2007, a 10 m flux tower (FT) has been operated as a part of PEARL. The tower is erected approximately 250 m NNE of the East end of the Eureka… Read More »Flux Tower<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":152,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"neve_meta_sidebar":"full-width","neve_meta_container":"","neve_meta_enable_content_width":"on","neve_meta_content_width":100,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":""},"_links":{"self":[{"href":"https:\/\/www.pearl-candac.ca\/website\/index.php\/wp-json\/wp\/v2\/pages\/892"}],"collection":[{"href":"https:\/\/www.pearl-candac.ca\/website\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.pearl-candac.ca\/website\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.pearl-candac.ca\/website\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.pearl-candac.ca\/website\/index.php\/wp-json\/wp\/v2\/comments?post=892"}],"version-history":[{"count":9,"href":"https:\/\/www.pearl-candac.ca\/website\/index.php\/wp-json\/wp\/v2\/pages\/892\/revisions"}],"predecessor-version":[{"id":1303,"href":"https:\/\/www.pearl-candac.ca\/website\/index.php\/wp-json\/wp\/v2\/pages\/892\/revisions\/1303"}],"up":[{"embeddable":true,"href":"https:\/\/www.pearl-candac.ca\/website\/index.php\/wp-json\/wp\/v2\/pages\/152"}],"wp:attachment":[{"href":"https:\/\/www.pearl-candac.ca\/website\/index.php\/wp-json\/wp\/v2\/media?parent=892"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}