Citation:

PANGAEA.987050

Name: Hourly time series of surface dissolved methane in an upwelling Bay (Coliumo Bay) of the central Chile, September 2024 - February 2025
Published: 2025-11-17
License: https://creativecommons.org/licenses/by/4.0/
Keywords: hourly time series; surface dissolved methane; upwelling bay

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Published: 2025-11-17 • DOI registered: 2025-11-19

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Abstract:

Hourly surface dissolved methane (CH₄) dynamics in an upwelling bay (Coliumo, 36.5°S, central Chile) were measured using a high-resolution buoy-based system to discern short term CH₄ variability in term of frequencies/periods and variance. Data was taken in a bay subjected to coastal upwelling off central Chile. Methane, temperature, and salinity sensors were mounted at a depth of 1.5 m on a coastal oceanographic buoy belonging to the Coastal Observation Program of the Department of Oceanography at the University of Concepción. Data recorded every hour during an upwelling period (September 2024-February 2025) are presented. Temperature and salinity time series were obtained with an RBR Duo3 (September 2024 to January 2025) and HydroCAT (January to February 2025), and the methane was recorded with a CONTROS HydroC™ CH4 Gen. III compact with 5P-pump. Sensors acurracy were ±0.002°C and ± 0.003 mS/cm for temperature and conductivity, and ± 2 µatm or 3% of the reading for methane, with a response time between 55 min (4°C) and 50 min (14°C). Due to a malfunction of the RBR salinity sensor, these values were recalculated based on the Practical Salinity Scale 1978 (PSS-78) (UNESCO, 1981), based on conductivity (mS/cm), temperature (°C ITS-90), and pressure (dbar), using HydroCAT values as a salinity reference.

Keyword(s):

hourly time series; surface dissolved methane; upwelling bay

References:

UNESCO (1981): Background Papers and Supporting Data on the International Equation of State of Seawater 1980. UNESCO Technical Papers in Marine Science, No. 38

Funding:

Center for Climate and Resilience Research ((CR)2), grant/award no. FONDAP-ANID N° 1522A0001

Instituto Milenio en Socio-Ecología Costera (SECOS), grant/award no. ICM 2019–015

National Agency for Research and Development (ANID), grant/award no. LF Fondecyt 1250210

National Agency for Research and Development (ANID), grant/award no. ST ANID Grand 21220537

Coverage:

Latitude: -36.538350 * Longitude: -72.941030

Date/Time Start: 2024-09-01T00:00:00 * Date/Time End: 2025-02-27T23:00:00

Minimum DEPTH, water: 1.5 m * Maximum DEPTH, water: 1.5 m

Event(s):

Coliumo_Buoy * Latitude: -36.538350 * Longitude: -72.941030 * Method/Device: Buoy (BUOY)

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	DATE/TIME	Date/Time		Farías, Laura		Geocode
2	DEPTH, water	Depth water	m	Farías, Laura		Geocode
3	Pressure, water	Press	dbar	Farías, Laura		Only used for calculated salinity
4	Conductivity	Cond	mS/cm	Farías, Laura	Self-contained dual channel conductivity and temperature sensor, RBR, DUO 3-CT
5	Temperature, water	Temp	°C	Farías, Laura	Self-contained dual channel conductivity and temperature sensor, RBR, DUO 3-CT
6	Salinity	Sal		Farías, Laura	Self-contained dual channel conductivity and temperature sensor, RBR, DUO 3-CT
7	Temperature, water	Temp	°C	Narváez, Diego	Multi-parameter moored CTD, Sea-Bird, HydroCAT
8	Conductivity	Cond	mS/cm	Narváez, Diego	Multi-parameter moored CTD, Sea-Bird, HydroCAT
9	Salinity	Sal		Narváez, Diego	Multi-parameter moored CTD, Sea-Bird, HydroCAT
10	Salinity	Sal		Narváez, Diego	Calculated	Calculated based on the PSS-78. A pressurre value of 2 dbar was used.
11	Methane, partial pressure	pCH4	µatm	Farías, Laura	Methane sensor, 4H-JENA engineering GmbH, CONTROS HydroC® CH₄ Gen. III compact

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0)

Status:

Curation Level: Enhanced curation (CurationLevelC)

Size:

25907 data points

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