JpGU-AGU Joint Meeting 2017

講演情報

[EE]Eveningポスター発表

セッション記号 A (大気水圏科学) » A-OS 海洋科学・海洋環境

[A-OS16] [EE] 地球規模環境変化に関する分野横断の海洋研究

2017年5月22日(月) 17:15 〜 18:30 ポスター会場 (国際展示場 7ホール)

[AOS16-P01] Ocean Macronutrient Fertilisation – An enhanced natural carbon sink?

★招待講演

*Daniel P Harrison1 (1.University of Sydney)

キーワード:Ocean fertilisation, Sequestration, Carbon Sink

In order to meet the goal of limiting global average temperature increase to less than 2 °C, it is increasingly apparent that anthropogenic CO2 sinks of up to 10 Pg C yr-1 will be needed before the end of the century. Ocean iron fertilization, although controversial has been shown to be one of the few technologies with a large capacity for removing CO2 from the atmosphere. Here I present the findings of a study to assess the capacity of an alternate form of ocean fertilization, Ocean Macronutrient Fertilisation (OMF). Sufficient phosphate exists outside the iron limited surface ocean to support once-only sequestration of up to 3.6 Pg C by fertilization with nitrogen. Ongoing sequestration using nitrogen fertiliser is estimated at 1.07±0.27 Pg C yr-1. If N and P were used in combination to fertilise the ocean, the size of the CO2 sink thus created is limited by societies willingness to utilize phosphate resources. Doubling current phosphate production would allow an additional 0.9 Pg C yr-1 sequestration and consume 0.07% yr-1 of known global resources. Environmental risks have received little quantitative evaluation; however it is likely they could also limit the scale of implementation.