What is the Martin hypothesis?
John Martin’s iron hypothesis—fertilizing the sea with iron—was first put to the test on the open ocean in 1993. According to Martin’s iron hypothesis, seeding the ocean surface with iron should make microscopic marine organisms like diatoms multiply dramatically, which might in turn cool the planet.
What is John Martin famous for saying about iron?
In July 1988, during at a lecture at the Woods Hole Oceanographic Institution, oceanographer John Martin stood up and said in his best Dr. Strangelove accent, “Give me a half tanker of iron, and I will give you an ice age.” These inflammatory words centered around a theory known as the iron hypothesis.
What does the iron hypothesis state?
What does the iron hypothesis state? Adding Iron can stimulate productivity in the ocean. All except “The amount of marine life in the oceans.”
What is iron fertilization hypothesis What is the purpose of this hypothesis?
Iron fertilization is the intentional introduction of iron to iron-poor areas of the ocean surface to stimulate phytoplankton production. This is intended to enhance biological productivity and/or accelerate carbon dioxide (CO 2) sequestration from the atmosphere.
What is Martin’s overkill hypothesis?
In the 1960s, Paul Martin (1958, 1967a), a geoscientist and paleobiologist, developed the overkill hypothesis, in which human hunting was proposed to have caused the extinction of the megafauna that roamed North America during the Pleistocene.
Is the overkill hypothesis true?
As it turns out, there is a lot of evidence for the hypothesis, and it leaves no doubt in my mind that the Pleistocene Overkill Hypothesis is legitimate. First off, the extinctions were very sudden and occurred at a much faster rate than species that become extinct “naturally”.
What are the main factors that contribute to the documented global rise in sea level quizlet?
Melting ice on land and thermal expansion of water are two of the most important factors causing sea level rise.
Is iron fertilization good for the sea?
“According to our framework, iron fertilization cannot have a significant overall effect on the amount of carbon in the ocean because the total amount of iron that microbes need is already just right,” Jonathan Lauderdale, an oceanographer and the report’s lead author, said in a press release.
What is the role of iron in photosynthesis?
Iron is an essential micronutrient for almost all living organisms because of it plays critical role in metabolic processes such as DNA synthesis, respiration, and photosynthesis. In plants, iron is involved in the synthesis of chlorophyll, and it is essential for the maintenance of chloroplast structure and function.
How does iron Fertilisation work?
Iron fertilization proposes to accelerate the transfer of carbon from air back to ocean. of the sinking carbon reaches the deep sea. A tiny fraction is buried in seafloor sediments. Most is recycled back to the surface 100 to 1,000 years later by the ocean’s circulation.
How did the extinction of megafauna shape human history in the Americas?
Terms in this set (8) PEOPLES IN MOTION: How did the extinction of megafauna shape human history in the Americas? Created mobile communities in America, extinction of animals from ice age led to rise of agriculture. S: Use of ecological and agricultural understanding to develop society.
What is prehistoric overkill?
Pleistocene overkill, the notion that humans overhunted megafauna near the end of the Pleistocene in the Americas, Australia, and beyond, is used as prime example of the impact that humans can have on the planet. In contrast, ecologists are more likely to accept that humans caused the extinctions.