Concentrations, ratios, and sinking fluxes of major bioelements at Ocean Station Papa
Concentrations, ratios, and sinking fluxes of major bioelements at Ocean Station Papa
复制标题
帕帕海洋站主要生物元素的浓度、比例和下沉通量
DOI：
10.1525/elementa.2020.00166
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
K. Buesseler
中科院分区：
文献类型：
--
作者：
M. Roca;C. Benitez‐Nelson;B. Umhau;Abigale M. Wyatt;Samantha J. Clevenger;S. Pike;T. Horner;M. Estapa;L. Resplandy;K. Buesseler
2018年夏末对与下沉颗粒有关的主要生物元素的通量进行了量化，这是亚北极东北太平洋PAPA海洋站附近海洋遥感(EXPORT)实地活动的一部分。钍-234法与颗粒氮(Pn)、总颗粒磷(TPP)、生物成因二氧化硅(BSI)和颗粒无机碳(PIC)的粒度分级(1-5、5-51和>；51μm)浓度结合使用，通过原位泵进行大容量过滤。我们以最近量化出口过程中的POC流量的工作为基础。与BSI和PIC不同的是，软组织相关的POC、Pn和TPP通量从50m到真光区底部(约120m)强烈衰减。在120m的巡航平均通量(mmolm-2d-1)为：POC1.7±0.6，Pn 0.22±0.07，TPP 0.019±0.007，BSI 0.69±0.26，PIC 0.055±0.022。这些生物元素通量与以前在该地点观察到的类似，只是PIC低了1到2个数量级。在上光区(通量220m/通量120m)，PIC(84%)和BSI(79%)的转移效率最高，其次是POC(61%)、Pn(58%)和TPP(49%)。这些差异表明，相对于POC或PN，TPP优先进行再矿化，相对于生物矿物质，软组织的损失更大。对这里获得的颗粒生物元素通量的全面表征将支持未来的努力，将浮游植物群落组成和食物网动态与下沉到更深水域的物质的组成、大小和衰减联系起来。
Fluxes of major bioelements associated with sinking particles were quantified in late summer 2018 as part of the EXport Processes in the Ocean from RemoTe Sensing (EXPORTS) field campaign near Ocean Station Papa in the subarctic northeast Pacific. The thorium-234 method was used in conjunction with size-fractionated (1–5, 5–51, and >51 μm) concentrations of particulate nitrogen (PN), total particulate phosphorus (TPP), biogenic silica (bSi), and particulate inorganic carbon (PIC) collected using large volume filtration via in situ pumps. We build upon recent work quantifying POC fluxes during EXPORTS. Similar remineralization length scales were observed for both POC and PN across all particle size classes from depths of 50–500 m. Unlike bSi and PIC, the soft tissue–associated POC, PN, and TPP fluxes strongly attenuated from 50 m to the base of the euphotic zone (approximately 120 m). Cruise-average thorium-234-derived fluxes (mmol m–2 d–1) at 120 m were 1.7 ± 0.6 for POC, 0.22 ± 0.07 for PN, 0.019 ± 0.007 for TPP, 0.69 ± 0.26 for bSi, and 0.055 ± 0.022 for PIC. These bioelement fluxes were similar to previous observations at this site, with the exception of PIC, which was 1 to 2 orders of magnitude lower. Transfer efficiencies within the upper twilight zone (flux 220 m/flux 120 m) were highest for PIC (84%) and bSi (79%), followed by POC (61%), PN (58%), and TPP (49%). These differences indicate preferential remineralization of TPP relative to POC or PN and larger losses of soft tissue relative to biominerals in sinking particles below the euphotic zone. Comprehensive characterization of the particulate bioelement fluxes obtained here will support future efforts linking phytoplankton community composition and food-web dynamics to the composition, magnitude, and attenuation of material that sinks to deeper waters.
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影响因子：
4.5
作者：
H. Ploug;M. Iversen;G. Fischer
通讯作者：
H. Ploug;M. Iversen;G. Fischer
DOI：
10.1525/elementa.2020.00107
发表时间：
2021
期刊：
Elementa: Science of the Anthropocene
影响因子：
--
作者：
David A. Siegel;I. Cetinić;Jason R. Graff;Craig M. Lee;N. Nelson;M. Perry;I. S. Ramos;D. Steinberg-D.
通讯作者：
David A. Siegel;I. Cetinić;Jason R. Graff;Craig M. Lee;N. Nelson;M. Perry;I. S. Ramos;D. Steinberg-D.
影响因子：
4.9
作者：
Iversen, M. H.;Ploug, H.
通讯作者：
Ploug, H.
寒冷的泵送：冷水硅藻的元素配额和化学计量
影响因子：
3.7
作者：
Lomas, Michael W.;Baer, Steven E.;Acton, Sydney;Krause, Jeffrey W.
通讯作者：
Krause, Jeffrey W.
影响因子：
11.4
作者：
Le Moigne, F. A. C.;Henson, S. A.;Madsen, E.
通讯作者：
Madsen, E.