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Element analysis of sediment core JR298-PC726 (2021)

Hillenbrand, Claus-Dieter ; Crowhurst, Simon J ; Williams, Mathew ; [et al.]

PANGAEA

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Publication Date: 2024-02-24

Keywords: Aluminium, area, total counts; Antarctic Peninsula; Barium, area, total counts; Bellingshausen Sea, Near crest of mound (IODP 732-FULL2 site BELS-2C); bioturbation; bottom current; Bromine, area, total counts; Calcium, area, total counts; carbon burn-down; Chloride, area, total counts; Chromium, area, total counts; contourites; Copper, area, total counts; Depositional patterns and records in sediment drifts off the Antarctic Peninsula and West Antarctica; DEPTH, sediment/rock; Ice-rafted debris; Iron, area, total counts; James Clark Ross; JR20150130; JR298; JR298-PC726; Lead, area, total counts; Manganese, area, total counts; manganese enrichment; Nickel, area, total counts; non-steady-state diagenesis; PC; PC726 CORE_NO 726; Piston corer; Potassium, area, total counts; Rhodium, area, total counts; Rubidium, area, total counts; Sed_AntPen_WestAnt; sediment drifts; Silicon, area, total counts; Silver, area, total counts; Strontium, area, total counts; Sulfur, area, total counts; Tin, area, total counts; Titanium, area, total counts; X-ray fluorescence (XRF); Zinc, area, total counts; Zirconium, area, total counts

Type: Dataset

Format: text/tab-separated-values, 73167 data points

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Radiocarbon ages of sediment cores JR298-GBC729 and JR298-GBC735 (2021)

Hillenbrand, Claus-Dieter ; Crowhurst, Simon J ; Williams, Mathew ; [et al.]

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Publication Date: 2024-02-24

Keywords: Age, 14C AMS; Age, dated; Age, dated material; Age, dated standard deviation; Antarctic Peninsula; bioturbation; bottom current; carbon burn-down; contourites; Depositional patterns and records in sediment drifts off the Antarctic Peninsula and West Antarctica; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Event label; GBC729 CORE_NO 729; GBC735 CORE_NO 735; Giant box corer; GKG; Ice-rafted debris; James Clark Ross; JR20150130; JR298; JR298-GBC729; JR298-GBC735; Laboratory code/label; manganese enrichment; non-steady-state diagenesis; Sed_AntPen_WestAnt; sediment drifts; W'Antarctic Peninsula rise, Crest of Drift 5; W'Antarctic Peninsula rise, Crest of Drift 6 (IODP 732-FULL2 site PEN-3B)

Type: Dataset

Format: text/tab-separated-values, 36 data points

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Discrete element analysis of sediment core JR298-PC723 (2021)

Hillenbrand, Claus-Dieter ; Crowhurst, Simon J ; Williams, Mathew ; [et al.]

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Publication Date: 2024-02-24

Keywords: Aluminium oxide; Antarctic Peninsula; Barium; Bellingshausen Sea, Distal part of Belgica Trough Mouth Fan (IODP 732-FULL2 site BELS-1); bioturbation; bottom current; Calcium oxide; carbon burn-down; contourites; Depositional patterns and records in sediment drifts off the Antarctic Peninsula and West Antarctica; DEPTH, sediment/rock; Ice-rafted debris; Iron oxide, Fe2O3; James Clark Ross; JR20150130; JR298; JR298-PC723; Magnesium oxide; manganese enrichment; Manganese oxide; non-steady-state diagenesis; PC; PC723 CORE_NO 723; Phosphorus pentoxide; Piston corer; Potassium oxide; Sed_AntPen_WestAnt; sediment drifts; Silicon dioxide; Sodium oxide; Titanium dioxide; X-ray fluorescence (XRF); Zirconium

Type: Dataset

Format: text/tab-separated-values, 408 data points

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Processing arctic eddy-flux data using a simple carbon-exchange model embedded in the ensemble Kalman filter (2011)

Rastetter, Edward B. ; Williams, Mathew ; Griffin, Kevin L. ; [et al.]

Ecological Society of America

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Publication Date: 2022-05-25

Description: Author Posting. © Ecological Society of America, 2010. This article is posted here by permission of Ecological Society of America for personal use, not for redistribution. The definitive version was published in Ecological Applications 20 (2010): 1285–1301, doi:10.1890/09-0876.1.

Description: Continuous time-series estimates of net ecosystem carbon exchange (NEE) are routinely made using eddy covariance techniques. Identifying and compensating for errors in the NEE time series can be automated using a signal processing filter like the ensemble Kalman filter (EnKF). The EnKF compares each measurement in the time series to a model prediction and updates the NEE estimate by weighting the measurement and model prediction relative to a specified measurement error estimate and an estimate of the model-prediction error that is continuously updated based on model predictions of earlier measurements in the time series. Because of the covariance among model variables, the EnKF can also update estimates of variables for which there is no direct measurement. The resulting estimates evolve through time, enabling the EnKF to be used to estimate dynamic variables like changes in leaf phenology. The evolving estimates can also serve as a means to test the embedded model and reconcile persistent deviations between observations and model predictions. We embedded a simple arctic NEE model into the EnKF and filtered data from an eddy covariance tower located in tussock tundra on the northern foothills of the Brooks Range in northern Alaska, USA. The model predicts NEE based only on leaf area, irradiance, and temperature and has been well corroborated for all the major vegetation types in the Low Arctic using chamber-based data. This is the first application of the model to eddy covariance data. We modified the EnKF by adding an adaptive noise estimator that provides a feedback between persistent model data deviations and the noise added to the ensemble of Monte Carlo simulations in the EnKF. We also ran the EnKF with both a specified leaf-area trajectory and with the EnKF sequentially recalibrating leaf-area estimates to compensate for persistent model-data deviations. When used together, adaptive noise estimation and sequential recalibration substantially improved filter performance, but it did not improve performance when used individually. The EnKF estimates of leaf area followed the expected springtime canopy phenology. However, there were also diel fluctuations in the leaf-area estimates; these are a clear indication of a model deficiency possibly related to vapor pressure effects on canopy conductance.

Description: This material is based upon work supported by the U.S. National Science Foundation under grants OPP-0352897, DEB-0423385, DEB-0439620, DEB-0444592, and OPP- 0632139.

Keywords: Alaska, USA ; Data assimilation ; Ecosystem carbon balance ; Ecosystem models ; Eddy covariance ; Kalman filter ; Net ecosystem carbon exchange

Repository Name: Woods Hole Open Access Server

Type: Article

Format: application/pdf

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