WASHINGTON — Janet Yellen will take the helm of a Federal Reserve facing a significantly different economic landscape from the one that dominated Ben Bernanke’s tenure as chairman, confronting her with different decisions as well.

Bernanke’s eight years leading the Fed were largely consumed with the Great Recession and his efforts to cure it by pushing down interest rates and pumping cash into the economy. Many economists think Yellen’s big challenge will be deciding how to ease off some of those very policies, which Bernanke took with Yellen’s support.

“Circumstances may demand more rapid tightening than people are expecting,” said Bill Cheney, chief economist for John Hancock Financial Services, who envisions a growing economy this year. He contrasted that with Bernanke, who he said had to decide “when to step on the gas pedal and how hard” as the economy recovered weakly from the recession.

The Senate confirmed Yellen, a long-time Fed official and economist at the University of California at Berkeley, by a 56-26 vote Monday. Supporting her were all 45 voting Democrats and 11 Republicans, while all opposing votes came from the GOP. Many senators missed the vote because frigid weather canceled numerous airline flights.

Yellen begins her four-year term Feb. 1, when Bernanke steps down. She has been Fed vice chair since 2010.

Nominated by President Barack Obama to the top job in October, Yellen comes to the post after a career in which she has focused in part on unemployment and its causes. Obama and congressional Democrats lauded her concerns for workers Monday.

In a written statement, Obama said Yellen’s approval means “the American people will have a fierce champion who understands that the ultimate goal of economic and financial policymaking is to improve the lives, jobs and standard of living of American workers and their families.”