Ocean phosphorus inventory: large uncertainties in future projections on millennial timescales and their consequences for ocean deoxygenation
Ocean phosphorus inventory: large uncertainties in future projections on millennial timescales and their consequences for ocean deoxygenation
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海洋磷库存：未来千年时间尺度的预测存在很大的不确定性及其对海洋脱氧的影响
DOI：
10.5194/esd-10-539-2019
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发表时间：
2019
影响因子：
7.3
通讯作者：
A. Dale
中科院分区：
文献类型：
--
作者：
T. Kemena;A. Landolfi;A. Oschlies;K. Wallmann;A. Dale
抽象。先前的研究表明，
由气候变暖引发的磷（P）通量可以增加
千年时间尺度的海洋磷库存，促进海洋生产力
和脱氧。在这项研究中，我们评估了主要的不确定性，
预测的P库存及其对海洋脱氧的影响，
中等复杂性的地球系统模型，用于相同的业务照常
到2300年的二氧化碳排放设想，
随后线性下降到零排放，直到3000年。我们对您的
在相同的气候情景下进行的模型试验，
地球化学P参数化表明，在模拟的范围内，
由于（1）风化假设中的不确定性，海洋磷库存
参数，（2）在斜坡和大陆架上的水深表示，
模式水深，（3）底栖磷通量的参数化和（4）沉积物磷库存的代表性。考虑到风化
参数最接近今天，一个有限的P水库和规定的
人为P通量，我们发现全球总的增加了+30%
海洋磷库存由5000年相对于工业化前的水平，造成
by global全球warming变暖.风化、底栖和人为P通量
分别贡献了+25%，+3%和+2%。总范围
在所有模式模拟中，海洋磷存量变化的百分比在以下之间变化：
+2%和+60%。亚氧体积比在一个
模型模拟与恒定的海洋磷库存。相当大
大量的额外的P离开了海洋表面而没有被浮游植物利用
通过物理传输过程作为预制P。在模型中，氮，
固定不能调整海洋氮库存，
增加磷水平或补偿氮损失，由于增加
脱氮作用这是因为低温和铁的限制
在极地土壤中，
低纬度地区。我们认为P风化的不确定性，
氮固定和底栖磷反馈需要减少，以实现更多
千年时间尺度上海洋脱氧的可靠预测。
Abstract. Previous studies have suggested that enhanced weathering and benthic
phosphorus (P) fluxes, triggered by climate warming, can increase the
oceanic P inventory on millennial timescales, promoting ocean productivity
and deoxygenation. In this study, we assessed the major uncertainties in
projected P inventories and their imprint on ocean deoxygenation using an
Earth system model of intermediate complexity for the same business-as-usual
carbon dioxide (CO2) emission scenario until the year 2300 and
subsequent linear decline to zero emissions until the year 3000. Our set of
model experiments under the same climate scenarios but differing in their
biogeochemical P parameterizations suggest a large spread in the simulated
oceanic P inventory due to uncertainties in (1) assumptions for weathering
parameters, (2) the representation of bathymetry on slopes and shelves in
the model bathymetry, (3) the parametrization of benthic P fluxes and (4) the representation of sediment P inventories. Considering the weathering
parameters closest to the present day, a limited P reservoir and prescribed
anthropogenic P fluxes, we find a +30 % increase in the total global
ocean P inventory by the year 5000 relative to pre-industrial levels, caused
by global warming. Weathering, benthic and anthropogenic fluxes of P
contributed +25 %, +3 % and +2 %, respectively. The total range
of oceanic P inventory changes across all model simulations varied between
+2 % and +60 %. Suboxic volumes were up to 5 times larger than in a
model simulation with a constant oceanic P inventory. Considerably large
amounts of the additional P left the ocean surface unused by phytoplankton
via physical transport processes as preformed P. In the model, nitrogen
fixation was not able to adjust the oceanic nitrogen inventory to the
increasing P levels or to compensate for the nitrogen loss due to increased
denitrification. This is because low temperatures and iron limitation
inhibited the uptake of the extra P and growth by nitrogen fixers in polar
and lower-latitude regions. We suggest that uncertainties in P weathering,
nitrogen fixation and benthic P feedbacks need to be reduced to achieve more
reliable projections of oceanic deoxygenation on millennial timescales.
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影响因子：
5.3
作者：
Floegel, S.;Wallmann, K.;Kuhnt, W.
通讯作者：
Kuhnt, W.
影响因子：
4.3
作者：
Eby, M.;Weaver, A. J.;Zhao, F.
通讯作者：
Zhao, F.
营养物质是塞诺曼期-土伦期海洋缺氧事件（OAE2）中缺氧和真氧传播的主要控制因素：模型数据比较
影响因子：
--
作者：
Monteiro F
通讯作者：
Monteiro F
影响因子：
5.3
作者：
Blaettler, Clara L.;Jenkyns, Hugh C.;Henderson, Gideon M.
通讯作者：
Henderson, Gideon M.